I doubt if there is anything like good or bad trader of altcoins. It is just a matter of luck. Those you think are very good in trading have also bought or sold at a wrong timing losing a whole lots of money. I believe it is nothing but just luck to make a fortune in altcoins trading.
I agree with you, in trading cryptocurrency, there's an extent of experience, which is built over time and the issue of luck. Some trades are won out of luck and not because of the TA or FA conducted. There's actually no certainty in trading cryptocurrency as the market is not regulated.