Because when new bull run will arrive there will be new shitcoins and your shitcoins will end dead or delisted from exchanges which can lead to 100% loss.History is always repeating.
5,5 years old chart:
- - - - -
Surprisingly some coins from this chart are up from then but volume on exchanges is low,so holders of these coins are truly bagholders.
a lot of good coins in the markets now,, if people still hold shitcoins thats really bad
people should learn how to identify a shitcoins
thats why a knowledge before make an investments on cryptocurrency is needed buddy