You're the sixth person to reply to me with this "advice". My own password is 30 characters and I self-host bitwarden_rs, patched to permit a higher KDF iteration count.
It's a trick. OP's password is actually 29 chars long, but the attacker will now start at 30 characters, and never brute force the actual password. Nicely played.
This has nothing to do with my usage.