It is better for a trader to just quit trading and fully focus on Bitcoin investment if he or she really interested in bitcoin investment.
Sure, bitcoin investment is always the best choice of investment when it comes to the term of crypto investment. Which is why bitcoin is highly recommended in the crypto market, because bitcoin have proven to be the best among other crypto currency more especially when it involves long term holding.
nothing is guaranteed in this life so I disagree with you when you only trading has no guarantee, because even bitcoin investment has no guarantee too, but it is more profitable and less risky than trading, trading is Very risky and it's not really that profitable compared to one long term holding.
You should only concentrate on this crypto aspect and not the other way round, moreover you don't even need to compare trading and bitcoin investment. And of course there's no guarantee when investing in bitcoin, due to the volatile nature of bitcoin but even as that it can never be compared with other crypto currency. Is it in the aspect of being profitable, Or risk? Of course bitcoin investment supercede all the crypto related investment. This is the reason why we shouldn't be looking out to other things except bitcoin investment, so that to enable us to be in the safer side.
And secondly if anyone must trade he or she should trade shitcoins and not bitcoin, because bitcoin it good for long term investment,
You have no right to decide for them on the one they will go for, so far as you're not the one providing the capital. So they have the right to decide if they're to trade with bitcoin or not, but the truth is that even when they decide to trade with bitcoin it won't even stop them from losing. So the best idea is just to choose bitcoin investment over that shit, because trading don't always work for everyone. Just like that of gambling that most people have been doing for years and they have not been profiting from it.