You are inflating the problem.
I play in a 3 night raid guild. Cleaning mythic.
The expectation is to play regurarly to keep your neck up to speed. Meaning? No farming. Just do your shit and you ll be ok. Basically it boilds down to doing 4 quests for emissary intelligently > do 4 quests that gives AP. No quest with AP available > wait next day > repeat.
We expect people to do 1 mythic+ 10 every week.
We expect like other guilds, that you play well your class (one, no alts required), dont die to dumb shit.
All this might be hardcore to some, but I feel it is rather light.