I don't even Raid currently.

I'm 7 6 6 6 with the Relic weapon, slowly progressing by running whichever dailies I feel like doing and not once did I feel like the grind was becoming too much.
The amount of work it takes to finish the relic is one thing but knowing that I'll actually have accomplished something at the end of said long road is a source of endless motivation.

I'd rather grind several months for a highly exclusive and powerful weapon instead of seeing every other [Class] own the same upgraded Anima weapon as I do.
Making the grind take this long ensures a much more rewarding payout. It's inevitable that SE will nerf the grind at some point so just wait until then if it's too much for you right now.