Where do you store your bank password? Couldn't the same be used for a seed phrase?

The sensitivity of my bank password is much lower than a seed phrase because most bank transactions can be reversed as long as I notice them in time and prove my identity to my bank.

With bitcoin nothing is reversible so every step of the process is a huge security risk where you can fall off a cliff and experience financial permadeath of "your" crypto, assuming a sufficiently motivated attacker.