What kind of gear are you grinding if not legendary?

What grind? Once you have ascended you're set. Worst case you can just change the stats for a few gold if you need to for some reason.

With respect, I think you are perhaps doing something wrong if you are experiencing a gear grind, and are not going for legendary equipment.

Exotic gear is perfectly fine for all endgame content except tier 4 fractals and, perhaps, harvest temple CM. Exotic gear can be acquired incredibly cheaply and then you're ready to go - if you need help, I'd be happy to advise.

It's ok to be bored with the game after a long time, just take a break, play something else and then come back if and when you feel like it.

But the gear grind part is very confusing, except for fractals you could still be meta with exotic berserker gear from 2012 in some builds. The game could improve in many areas but gear grind doesn't seem one of them.

Yeah, you need to spend some gold for BiS but usually even that doesn't require any kind of group activity or grind. At most some ls currency farm if you don't have any spares

Outside of legendary (which is purely looks and convenience) I don't see any big farm or grind required