User blog comment:JHeroJr/Extensible U-system/@comment-34422464-20190603230048

What's the point though. Even though it does create new numbers, it doesn't do it in a new or interesting way. It just replaces the base function with BB(n). Essentially it's a naive extension and doesn't contribute to Googology due to just changing a base case to something somewhat bigger. I really expected interesting and elegant recursion, and this is what I got instead.

Not to hate though, I think that if you tried really hard you could create something that is somewhat interesting.