(FI is the best, purest advocacy of reason. But if you disagree with that, no problem, just substitute in Objectivism, Critical Rationalism, or something else. The points I'm making here do not depend on which philosophy of reason you think is best.)
(The percentages are a loose approximation to let me write this point in a simpler way. If you don't like them, consider what's going on when someone partly agrees and post a comment explaining how you think that works, and how you think I should have written this without percents. I'm trying to discuss the case of a new person who agrees with some stuff, disagrees or doesn't know a lot more, and learns a bit more over time.)
Now, imagine over the next 5 years they increase their agreement to 30%. Is that good progress? A nice achievement? A proper application of gradualism?
No, I think that's a disaster.
In that scenario, they just lived for 5 years while contradicting at least 70% of FI. How can they do that? Why don't they completely hate themselves? Here they are finding out about reason, and then living a 70% anti-reason lifestyle. How do they live with that?
The answer is: they deny that 70% of FI is good. They oppose it. To not hate themselves, they have to hate most of FI instead. They have to come up with a bunch of evasions and rationalizations, and they've had 5 years to entrench those.
The moment you find out about reason, there is a ticking clock, because it's so very hard to live with contradictions. It's not viable to just live for 5 years half liking reason and half hating it. You'd tear yourself apart. You have to do something about this tension. FI offers ways to deal with it, but to use those you'd have to learn more about FI and embrace it more thoroughly. And irrationality offers ways to deal with it – rationalizations, evasions, self-lies, etc...
The middle, caught in between reason and unreason, is not a viable long term place to be. It doesn't work. It's not just a mess of contradictions like many people's lives, it's more like the strongest contradiction there is. And who could live with that? The only person who perhaps could, like John Galt, would be a better person and wouldn't even be in that situation, since he'd embrace reason more.
So at the same time this person learned 10% more about reason in 5 years, they also figured out how to rationalize not learning the rest, and be OK with that. They made up stories about how they will learn it one day, later, but not now. They backed off from feeling like reason is truly sacred in order to to reduce the contradictions in their life. They lost their sense of urgency and excitement about new possibilities, most of which they've now put off for 5 years. Most of which they still don't plan to start learning for years.
When there's a contradiction, something has to give. When you have such a strong major contradiction that's so hard to ignore – like life vs. death, reason vs. unreason, thinking vs. unthinking, open society vs. closed society, problem solving vs. destruction, initiative vs. passivity, independence vs. obedience, infinity vs. finite limits – then something has to and will change pretty quickly. And if they don't embrace reason in a big way, then it's clear enough what happened: while making their bits and pieces of supposed progress, they actually managed to find a way to either deny all these major contradictions exist or take the wrong side of them and be OK with that. There's no other way.
Once someone finds out about an idea and finds it notable and important, they have to take a position.
E.g. that it's good in theory but not very practical to use in life all the time. That's an example of a well known evasion. Or they think it's pretty good, but it's for geniuses. Or they think it'd be nice to learn it and they will work on it, later, but they are busy right now. There's many other evasions possible, many ways to rationalize why they aren't acting on the idea. Or they could believe it's really urgent and serious and try their best to learn and use it, which would be a good attitude, but is very rare. People always take some kind of position on ideas once they find out about them and acknowledge those ideas matter.
So the scenario I talked about, which I think lots of people see as an ideal to strive for, is actually really bad, and helps explain why the people pursing that plan seem to be stuck indefinitely and never become amazing.
Life is now. Reason is urgent. These things get much worse over time unless you're making rapid progress and pursuing reason with the utmost seriousness and vigor. There can be no compromises where you work on rational philosophy a little bit here and there in your spare time. It can't wait. Nothing's more important than your mind. Prioritize your mind now or, by betraying it, you will destroy it and never again want to prioritize it.
As always with these things, there are rare heroic exceptions which no one knows how to duplicate on purpose, or predict, or how it works, etc. The human spirit, or something, is very hard to crush with literally-exactly 100% reliability, and there's billions of people. Here's a few quotes about that from The Return of the Primitive, by Ayn Rand:
“Give me a child for the first seven years,” says a famous maxim attributed to the Jesuits, “and you may do what you like with him afterwards.” This is true of most children, with rare, heroically independent exceptions.
With very rare exceptions, [young men with independent minds dedicated to the supremacy of truth] are perishing in silence, unknown and unnoticed.
There are exceptions who will hold out, no matter what the circumstances. But these are exceptions that mankind has no right to expect.Finally I'll leave you with one of my favorite Ayn Rand quotes about urgency, about now, not later:
The Virtue of Selfishness, Doesn’t Life Require Compromise?:
The excuse, given in all such cases, is that the “compromise” is only temporary and that one will reclaim one’s integrity at some indeterminate future date. But one cannot correct a husband’s or wife’s irrationality by giving in to it and encouraging it to grow. One cannot achieve the victory of one’s ideas by helping to propagate their opposite. One cannot offer a literary masterpiece, “when one has become rich and famous,” to a following one has acquired by writing trash. If one found it difficult to maintain one’s loyalty to one’s own convictions at the start, a succession of betrayals—which helped to augment the power of the evil one lacked the courage to fight—will not make it easier at a later date, but will make it virtually impossible.