Well there are different mindsets anyway. For starters, it would not really hurt to start first in relying your coins to a trusted third party. There would be factors such as KYC that would make people just stop using these centralized exchange and I gotta be honest that sometimes I just want to say "fuck it I'll hold it for now in a custodial wallet for its service offered as well".

There is no perfect security nor perfect safety, but we could help risking our money to strangers that would not think twice stealing our money. Back when I was day trading, I did not trade small amount but in the end I still withdrew it all.