>>29086370grinding has always been possible, its just supposed to be tedious to discourage the player from overleveling and to instead attempt to best the challenge presented intelligently
multiplying xp gain 4x undermines that, allowing any challenge to be bypassed by pressing a button and invalidating the purpose of the challenge in the first place, drawing developer focus away from proper game design and level progression
early exp share makes for a bad game
its a useful tool for postgame since most/all the trainers will have been defeated, but giving it to the player early is a development crutch to keep them from having to make intelligent design decisions
people dont want it removed, people want gamefreak to put thought into their game rather than phoning it in