They are not common and you don't lose any money, if they are stolen from banks.
> It's easy and highly encouraged by every cryptocurrency wallet to backup your wallet seed
That's not protection, that's just preparing for the worst, hoping for the best.
> I don't, I have them split into multiple wallets, sort of like my fiat money.
You are not an average user then
And that's why you show symptoms of survival bias
> That stays home just like the debit card for my main bank account.
You debit card cannot easily be used to steal money from you even if someone steals it physically