No genre is exclusive to each other, I'm not talking about genres.
There is a huge difference between singleplayer and MMO just like between movies and TV series. As usual to understand me better, I'm pulling up Santa Barbara TV soap that spawned more than 2000 episodes worthless to me, yet brilliant to some other people.
While I can't understand need to grind urges because such process makes me sick, still can respect your choice as a buyer. It's publishers who lie and falsely advertise junk as if it was a diamond. Not vice versa, but again, you don't have to trust me.
MMO is not RPG and can never ever be RPG. Unless you're Ubisoft who believes that we believe their lies where Division MMO is advertised as RPG. To you it might be RPG. To me? Never. Tetris is more RPG than that trash.