>>52690343Because people would put themselves on Set mode accidentally, find out that they're no longer able to switch out Pokemon when they beat a trainer's mon in battle, and then have no clue how to undo whatever they did.
The only real mechanical benefit in keeping Set mode was that it'd remove a single dialogue prompt before a trainer sends out their next Pokemon. Beyond that, Set mode just served as a 'make the game slightly more challenging' button for competitive enthusiasts. And I say this as someone who actually likes Set mode.
The existence of Set mode until this point was a trade-off between appeasing people like me who want to complete battles as quickly as possible and steamroll with my overpowered team, and appeasing the actual target demographic (literal children) who are more than capable of accidentally scrolling through a menu, toggling a bunch of settings one way or another, then don't know why they suddenly can't switch out their Quaxly when an NPC trainer sends out their Pikachu on the heels of a previous KO.
If a minor QoL improvement for optimizers and speedrunners is going to continue to provide a negative impact for the actual intended target audience of your product, why wouldn't you remove it?
