What if instead having negative M+ affixes we had positive ones, and the difficulty went into making the dungeons more complex and denser.
So instead of having stuff life storming, thundering, grievous.
We would have affixes like:
Interuptor: Successfully interrupting a cast grants 100% more damage for 10 seconds.
CCer: Successfully crowdcontrolling a mob grants 300% more haste for 5 seconds, cannot occur more than once every 20 seconds.
Vamprism: Staying 8yd away from party members grants 5% all secondary stats and 15% more leech
Rally: For each ally within 8 yards, take 5% less damage and deal 5% more damage
Guerilla: Every 1 second you do not take damage you gain 1% all secondary stats, this buff is permanent and the stack counts up only during combat
Immortal call: Every 15 seconds of combat alive grants 0.5% all secondary stats permanently, the buff is reset upon dying.
These are just examples, the point is, having positive affixes that encourage certain playstyles and making the difficulty be from the dungeon itself, by giving the mobs massively more health and more complicated abilities would kinda be fun and less frustrating.