For me, skills and experience aren't enough for you to become a successful trader, i think even a well known trader are still experiencing loss in their trades from time to time. It's not about skills and strategies alone, people should have their own risk management and how they plan their trade. Also, trading should not be your main source of income as it doesn't guarantee profit as often.
If you take risk then you won't have that skills and experience. You will have to go the a point that you are uncomfortable and see how it goes. Others might find it very hard though, so they gave up trading. Maybe there are a few who doesn't gave up even if they losses big money until to the point that they might have thought that it's not going in their way and so they stop and strategize or even really quit. But I do agree that it's not for everyone, trading is really very hard, others might sound as if it is easy, but it's not. You really have to go into several stages here and passed before you become a successful trader and not it's not a easy path. Maybe there are good people, but it's not for everyone. And I think that's part of life itself, there are things that are not really meant for us. There could be other things in crypto that will fit the most of us just like accumulating and HODLing.