Heh, I still use game trainers for games that have annoying grinds. The Assassin's Creed games come to mind. There is no way I'm spending 150 hours on grinding just to progress through a level gated region of the map.
Some people just want casual gaming and having part of the map locked off forever is depressing - in my case, Forza Horizon 5, never bothered to do the grind, just drive around aimlessly, but I want all the cars and interesting places to be open. Maybe a "casual mode" setting?