Contemplating the last Dragon Quest game I played on the DS, and the “end game” phase, after all regular story content is beaten, where they offer basically an endless marginal progress phase that allowed me to play 2 or 3 times as much time just grinding endlessly for nothing more than the sake of grinding endlessly. I would get xp or +1 str, or whatever little uptick in stats I could get.
I wish, WOW would offer something similar. A grind that grants a small uncapped benefit as long as we continue to do it.
For example, to incentivize M+, if I run a mythic dungeon at +11 or higher, I gain +1 intellect (or main stat, whatever yours is) from the run. Myself and others would likely run hundreds of runs (time being the big factor) to just to get one more point each time. In the end the marginal improvement wouldn’t even be very much (hundreds of a stat on thousands of stats), the cap becomes time/willingness to continue doing it and the benefit isn’t game breaking, but it is also “something”, so that engagement continues after people max gear.