Actually I didn't say Tibbel was wrong, that was another poster, I think you confused us.
But anyway, that poster was commenting on one specific line: "There is no "diminishing return point" -- the relation between surge rating and critical damage bonus is a smooth curve all the way from 0 to infinity."
There is a diminishing return, noted both in the Patch notes and the responder's comment. So his point is valid. Not a big deal, just making sure people understand that Surge doesn't scale forever anymore.
EDIT: I agree with what you are saying that there is not a single POINT at which this happens, although the OP was asking about stacking Surge rating up, and there is an increasing point at which it no longer has enough benefit to be worth stacking.