Ok, I have changed my mind and see this feature as important now since we cant even use tickets on events. 600 event runs achievements is gonna be much faster with this.
I agree. The event runs need to be zoom zoom zoom before the battery dies.
For these types of games (most of those with auto mode), a 2x or 3x is kind of a staple when your team is lawnmowing the stages, saving a bit more time. Kinda crucial if you have limited time to play per day. There's this Japanese game I've been playing for years that updated its UI with a x2 speed button to hasten attack and skill animations - and it doesn't even have auto mode.
So yeah. Speed button plox.