In coming expansions I really think it’d be wise to have mythic+ auto-adjusted a very small amount each week.
The servers would keep stats on completion rates and wipe data, then at the end of the week something like:
Dungeon that bricked the most keys: +5 sec to timer
Dungeon completed the most: -5 secs
Boss that caused the most wipes: -1% heath and damage
Boss that caused the fewest wipes: +1 health and damage
Dungeon attempted the least: -1% to trash health
The idea being that making frequent tiny adjustments early is way better than waiting 6 weeks and then having these big balance changes, adding or removing 1-2 minutes from the timer, etc.
It would also push the hardest and easiest dungeons closer to the middle in terms of difficulty much sooner.
There could be limits, too, this wouldn’t make all dungeons the same length.
The 20, 25+ crowd might want more static health values, this change is more intended for the majority