>>42125067With transfers being a factor, it was always useful to go back to a previous gen and catch old legendaries or breed old shit, either because they were inaccessible in the current games or because they could learn moves they can't in later games.
On the competitive side, playing a third/ultra version is effectively replaying the same game, which again you'd do to get access to new Pokemon/formes, tools, moves, etc.
Took me several months to finish USUM just because the endless interruptions made me put the game down over and over. It wasn't fun, because I had already seen 90% of its story and it wasn't engaging on a second playthrough.
The games desperately need scene skips if this direction continues. It's a feature almost all modern JRPGs have, because literally no one likes rewatching the same scene over and over and over in the event they have to deal with a tricky boss. Not like Pokemon has any remotely tricky bosses, but it could still heavily benefit from scene skips.
Also, Battle Frontier make Emerald and Platinum both worth replaying.