User blog comment:Billybob-mario/Hyperrecursion of Uncomputable Functions/@comment-4224897-20150427222636/@comment-4224897-20150428012813

up-arrow style iteration over the FOOT functon is not any more "interesting" than up-arrow-style iteration over whatever other really powerful googological function, since either way it's just a naive extension, and naive extensions aren't anything new in googology. and recursion stronger than up-arrow style recursion is supposed to take more effort to define - that's actually part of the point.