If you say more profitable, I don't think that's the right word. Because current bitcoin investors and also old bitcoin investors, if you look at the price of bitcoin, it is clearly more profitable to buy bitcoin in the past. So if you look at this, it is clear that bitcoin investors who have been around for a long time can be said to be more profitable than current investors. However, if viewed from a scientific context, it is true that bitcoin investors who are just starting out now find it easier to find information about bitcoin investment. Because as you said, we can take the experiences and mistakes experienced by previous investors and use them as lessons for us now.
Well, you might be right but there are things you still need to get straight away. However, If we conclude that Bitcoin can't be profitable in future because those who invested on Bitcoin in the past have already profited from it earlier/now, that means we are making a big mistake.
The reason why it looks like you can't get profits from Bitcoin in future is because you are thinking that it's too late to get started by investing. People who invested on Bitcoin in the easiest age were lucky to have that opportunity to buy bitcoin at a low rate. But presently, this is our own opportunity to get started with DCA method and invest on Bitcoin.
Bitcoin was listed in the year 2009 (if am not mistaken) and those that was opportune to buy it in 2010 were the luckiest ones, and from 2009 till date is 15 years old and Bitcoin is $67k+ (despite the new ATH). Which means in the next 15 years more, BTC will worth more than this, so let's clear the doubts and start accumulating some Bitcoin.
It's a good explanation that explains that technology is improving because some of us don't have to make mistakes before we know what we don't. Those who made mistakes in the past has also learned their lessons and take corrections too. So we don't need to make those mistakes because we have learned from those who made mistakes.