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Auto makes it dangerous for everybody, even for Trick Room teams because you can reverse it by switching in
Speed is probably the one stat that is a crux for a pokemon's performance, and we'd be playing around with every pokemon's speed stat. If you think pokemon underperform because they are too slow now, with auto Trick Room, you'll have fast pokemon being denied now too. The problem doesn't immediately go away for slow pokemon, because Trick Room reverses, but now the same problem will affect more pokemon.
Faster teams would have to run Trick Room setters to reverse the opponent's Trick Room. But because it is automatic, if the opponent doesn't bring an auto setter, the faster teams will be auto screwing themselves over too.
Perhaps the settled meta would revolve around mid speed tier pokemon that would be okay whether Trick Room is up or not. Frankly, because of how many pokemom this could screw over, fast or slow, it would probably be just banned outright.
