I think that one real issue in discussing "limits" is that in English there is a connotation to "to limit" means "to reduce." And of course in discussing limits of pleasure, there is an inference that we draw from use of this term in discussing desires and pleasures that it would be a good thing for "pleasure" to necessarily be "reduced" -- and I don' think that was the intent of Epicurus at all.
FIrst of all, "reduce" and "limit" aren't necessarily the same thing.
We've been distinguishing desires from pleasures, and it certainly makes more sense to "Reduce" desires than it does to "reduce" pleasure. In fact the supposed reason to reduce desire in the advice of Epicurus is in fact to **increase** pleasure.
We're making very useful observations about limits and their importance, but as we do so I think the elephant in the room that must be avoided is implying that by using the concept of limits (and I think limits are a concept) we not accept the stoic desire to see limits of pleasure or limits of desire as being chains that tie us down from experiencing the type of full pleasurable life that might otherwise be possible.