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I think the real problem is that it can throw off calculations
At the end of the day, Smogon is a numbers game. While it IS possible to take into account evasion when doing calculations, the very idea that it can throw a wrench into so many builds is seen as BS.
But that's mostly speculation on my part, as there are plenty of moves that get a lot of use that aren't 100% accurate soooo...
It's a controversial choice but so are a lot of restrictions nintendo's own tournaments have (such as an outright restriction on certain pokemon rather than grouping them into tiers. Both sides have valid arguments for and against)
Competitors HATE elements of chance in their games. They want victories to be based completely on the "skill" and "research" they did, and not get completely trumped because of a coin flip...they want as few random elements in play as possible.
There are also those that love the random elements, and say that those who prepare and plan for them are the best players.
Just like I mentioned earlier, both have good points and bad points. The key is to make a decision and be consistent about it.
That said, I note that barely anyone complains about banning moody or one-hit-kill moves.
What Smogon's rules try to prevent, though, is matches that are reduced to struggle-fests. Watching as two players try their damnedest to HIT each other isn't interesting for anyone involved. The only way to end a match like that is for someone to luck out, a forfeit, or struggle.
As for my opinion...I have no problem with one group having a clause that another doesn't. It makes situations like the tournament that was won by a guy that didn't adhere to Smogon because Smogon's rules weren't in play all the more interesting.