Artificial AI?

[alphafighters]

I recently came to knew about Lord Silva's tutorial about patching the exe for creating the AI for unknown IDs. I have some queries regarding this :-

Firstly, is it necessary? If I dont do it, what are the possible consequences in the gameplay?

Secondly, there are countless characters built everyday. Which means that the character in AI would be non - functional?

I am asking these questions coz I felt that my ReVet ( the Bat in my sig) char become non functional in Demo and Stage mode.