Enough of the required dailies, islands, and other bullshit. Also, mythic+ rewards getting nerfed has been a long time coming. Thank god they finally had the courage to do it. A mode that is infinitely farmable and has a much larger loot pool to be able to find the right stat combination you need shouldn't be stronger than raiding which is stuck on a weekly lockout and requires more players to put together.
Do mythic+ because it's enjoyable to you to push your IO score or something, not because you feel compelled to run it infinitely for power. The fact you felt compelled to farm it for character power shows why Blizzard was right to nerf it.
The game was better when character power had a weekly cap. Honor cap, conquest cap, valor cap, weekly raid lockouts, heroic dungeon lockout etc. You are finished with your character's lockouts? Great. Play a different character. Ever since legion I barely ever played an alt because I felt like my main could still progress and it was a waste of time to play an alt when I could be progressing my main.