as for the exp is too fast thing, i disagree, adding higher exp bars doesnt increase the amount of things to do at any level range. All it does is give you longer times grinding exp in one go. Now possibly, to slow down the time people spend in a level range, and the things they can do during it, maybe they need some more roadblocks. Limit breaks, or having to do quests/content to unlock new areas.

That said, hardcore grind people probably wouldnt like having to stop their grind to go do content. So really it comes down to, you cant tailor a game for every one. Yeah you can grind 50 in a week if you are hardcore, but if you were playing 2 hours a day 3-4 days a week, it would take substantially longer. They really cant have a system that works for both hardcore and not hardcore, they tried, it was fatigue, and no one was happy.