idk about that. tanking above the current M+13 now sometimes feel harder than heroic raids.
My main issue with M+ is that time taken vs rewards given is not enough. For eg. if i take 1.5 hr to clear heroic tos now, i will almost certainly get at least a couple loot. But in that same 1.5hr, i could maybe clear 3 to 4 M+12 or M+13 and get no loot. of cos it could take shorter or longer depending on affix, but the consistency of loot imo is just not there for M+.
As of now, I just do 1 M+10 for the weekly chest and thats it.