I certainly agree with you that most traders who change their mindset and later focus on investment after series of losses, majorly because they've learnt a bitter lesson
You're right but sometimes they might also want to diversify which is by going into crypto investment, and still continue with thier trading. And of course this is how must traders do, so that should incase they experience lose in trading Maybe they can be able to recover it through thier long term investment. I have an idea about a trader who have been making use of this method, And of course as a trader is very good to diversify since we don't have a guarantee about the outcome.
because losing can occur at anytime, And if you're this set of traders who always expect profit all the time definitely you will be so disappointed because that's where your hope lies. which is why as a trader is very essential to look into investment while trading so that you can be able to minimize most of the loses you will experience in trading, That's for those folks who have decided not to quit from trading regardless to their loses, but I think going with this method will help them to minimize thier loses.
It is always hard for a trader to be investing at the same time even though, I know that some people do it. This is because you cannot serve two masters at the same time, you will love one than the other. You will not be able to grow your bitcoin investment in a fast pace with consistency and persistency for 4-10 years and through DCA. This is because your attention will be diverted into trading and the possibility of you tapping from your bitcoin investment to trade after losing your trading funds is high.
If you are not someone that is more focused on investing than trading, you will end up using almost, if not all of the funds that you are investing to trade because you believe that you will make profits and replace the funds, which might not be possible. Thos is why brand new investor shouldn't think of trading but only investing in bitcoin for long term, so that they can have all the focus to reach their bitcoin goal.
Another thing that a trader cannot let go is for him to see that his bitcoin investment is in profit, he will definitely sell to take profits. Any trader feels he is smart enough to invest his profits into bitcoin will always sells all his portfolio in the bull run. Which I wouldn't call investing.