"The risk of having 100% in self custody for me even on a ledger is equally high compared to having some on centralized exchanges. I just by default like to spread funds around as much as possible ..."

Hmmm. Not sure I understand your perspective on the first part ...

But ...

On the second part, my version is to ensure I don't have all of my investments on any one blockchain. Most of these DEXes, etc. are on EVM-based blockchains (7 of which are supported by ParaSwap). I make some effort to keep funds distributed amongst them ...