To your 4th point, I get the 2 renown in about half an hour, 1 wing of flawless torghast for the weekly adamant vault (25-30 mins) and one speed run wing done in about 15.
So yes under 1.5 hours a week to progress my character, instead of literally islands or maw of souls FOREVER.
Also i love how people say "i have to grind in shadowlands but in bfa i could just wait a 4 weeks and catch it up".
You can... do that... with.... renown...
Essences you couldn't wait and catch up, corruptions you couldn't wait and catch up, azerite pieces you couldn't wait and catch up.
literally the only thing you have to do weekly is 30-45 mins of torghast IF you don't have a 262 leggo
Edit- also mop and wod were was worse for alt friendliness as you stuck behind an endless gated quest chain for your leggo, imagine trying to compete without the ring or cloak proc compared to the 200 dps between and 190 and 260 lego