On some classes, if you overgear mythic 0 and raids you can just grind both and solo them and get the top tier gear (through the vault). And then you don’t deal with the groups.
This can be done on prot paladin (probably best choice, they have infinite healing and are the naaru themselves with how brokenly OP they are, literal immortal gods/goddesses) and… blood DK as usual two suspects. I’m gonna try it on vengeance. Guardian druid probably. I’ve seen youtube of very overgeared hunters being able to do it. Same with warlocks. Don’t think very many other classes it be possible on.
I guess an extremely skilled EXTREMELY overgeared mage can do it…but then…whats the point if have max gear already.
The post at the bottom here by Picksi says how to do it