I truly believe that adding any password manually is the wrong approach. The risk of a typo just is too high. For me copy-paste already seems to be a better option. And instead creating passwords within Bitwarden definitely removes almost all risks of failure due to the lack of human interaction. The only remaining risk of that method is not hitting Save when done. And even then you are still covered by the Password History of the password generator.
I agree, I always try to generate within the app or copy/paste, but there are many cases where this is not possible. (For example, entering passwords from my work computer into my personal Bitwarden) An optional field with a manual password entry consistency check would reduce the risk of incorrect password entry to near zero (which you yourself say is significant). Thank you for the reply!