I'm not entirely sure if you argument is that we should keep Arena Trap only to keep other broken stuff in check or else but that's probably the weakest argument possible. We can simply suspect test o quick ban the other broken shit. We are 4 months into the metagame for God's sake, don't treat it like this will be the last test.B
te who says shutting down some pokes that left unchecked could destroy a meta?? . Btw also banning arena trap would murder poor Trapinch.
Anyways, Arena Trap is unhealthy in every post team preview gen that was allowed. It wraps the metagame around what can abuse it both as the ability (Duggy, Trapinch) and the ones who get better with it's assistance (Dracovish likes Seismitoad gone with Giga Drain Trapinch support, Sun likes Tyranitar gone, Keldeo likes Toxapex and some fairies like Sylveon gone, etc) while also invalidating others that could perform really well in the metagame like Toxtricity, Dracozolt, Cinderace or Incineroar in this current generation. It's a centralizing ability every time it's legal since B/W and should be gone.