It matters. It may trick people into thinking that longer = more secure. Which is only the case up to a certain extent. If you reach beyond 256 bits of entropy

It matters. It may trick people into thinking that longer = more secure. Which is only the case up to a certain extent. If you reach beyond 256 bits of entropy, there is no added security. No current system will use more than that. And going beyond that is not future proofing, because you're storing it in a current system, defeating any added entropy. I don't see good reasons why you would use a password generator embedded in a password manager for non-security purposes. Security purposes here are always more important than other uses. But if you do have a good example, feel free to prove me wrong.