If people want these clauses tested thats fine, but I suspect that testing DT/OHKO/etc isn't going to be nearly as straightforward as testing a couple of Mons. It was easy to test Garchomp for instance as people know how Garchomp is played best.
On the other hand for a lot of us its been a long time since we've played with Double Team or Fissure so I would expect that in a test it would take a long time for people to find the best (and any possible broken) way to use these moves. Just like how it took a good while to discover a lot of the strategies & sets that would be considered metagame staples, there would most likely be a similarly long teething period in testing these clauses.
Should no moves be banned? And banning only apply to Pokémon? I think that may be a correct solution.
I think part of the reason why things are as they are is because we don't want to ban more than we have to.
Lets say we only ban Pokemon and not moves from now on, and Double Team proves to be broken. By your logic we have to ban 99% of all Pokemon and well yeah.
I cannot believe what I am reading. Pure competition (whatever that is) may be what its about to you, but thats a surefire way to drive away new players and kill any future competition. Other games and sports understand the importance of maintaining a following, and an important part of that is making it worthwhile to newcomers.
Go on and ask a selection of people from the top of the ladder if they'd still be playing if they didn't enjoy it or if they'd have started at all if Pokemon wasn't fun or satisfying to play.
Even if DT/OHKO/etc aren't entirely broken, if they create and overly negative play environment they'll kill competitive Pokemon pretty quickly and tomorrow's #1 player will not appear.
Plus no matter how good you are you can't beat the odds of the luck you face consistently. In a tournament environment you might beat 3-4 DT abusers only to lose to the worst one because they got lucky. Sure this can happen anyway with critical hits, but do we want that to be the exception or the norm?
I'm not sure what the official stance here on banning things is, but I'm going to assume that Smogon isn't in the committing suicide business.