Wouldn't JSONPatch, JSONPointer be better in Foundation?

Maybe a better way to frame the question is "how can this API's be made public?"
Which will lead to where they can go.

I understand Foundation is supposed to be svelte vs. bloated.

With your years of JSON experiences, now that you know of the IETF RFC's and their capabilities, can you see in hindsight how they could have been beneficial in past projects?

It is good timing that the Foundation workgroup formed.