There is no substance to this post whatsoever. The only thing I took away from this is that you will be voting Do Not Ban, but nothing else of any value at all.Let me preface this by saying that I don't think most if any abilities, items or anything normally in game should be considered for banning so quickly.
#0. Team Preview
#1. Dugtrio is far from the most oppressive thing in the SS OU Metagame.
(I don't know absolutely everything about the metagame as no one person could, but fast monsters with high attacking stats, super walls of HP and ability boosted bulk, Tricky mons with great typing, great movepools, seem to be faring well.)
#2. Banning this ability essentially bans a pokemon and an entire VALID way to play the game.
#3. There is so much counter-play it is not even funny.
(If you reply with how trying to check Arena Trap feels inherently like a problem, you're part of the problem)
#4. Team Preview
Definite no when it comes to banning this.
#0. What does that even mean? The issue of AT cannot be mitigated just by seeing it in team preview. It does not resolve the fact that it's a brainless way to forcibly revenge kill threats and remove walls just by virtue of its existence nor does it resolve the issue of having to run a sub-optimal item on otherwise good Pokemon specifically to counterplay the thing. This is a non-point.
#1. Every Pokemon in OU is in some way included in your sub-point, that's what Pokemon are. Other breakers can be walled however, other walls can be broken, every typing has a weakness. Counterplay is skillfully possible to other mons in the game, less so against trappers who again take minimal prediction to achieve maximal results in almost every case.
#2. Yes, that's the point of banning. Capitalising the word 'valid' does not mean anything, what the hell is a 'valid' way to play? We're looking for an enjoyable way to play in a healthy metagame, who cares if it's 'valid' or not?
#3. A point with no evidence followed by a strawman. What is your extensive list of counter-play options?
#4. Making the same non-point twice doesn't make it any better.