Yes! The primary reason for me is that a password manager requires a memorable, not too long password. At least on my local device. This generally makes it less safe than a random string of characters, which I like to protect my Proton account and particularly Proton Mail with. So not having this feature pushes me towards unsafer practices, which -I think- is not what Proton as a company should want.

A password that can be used to sign into proton pass thats different from the password used to sign into everything