Stop needlessly picking apart things that have nothing to do with the discussion. Maybe my words could have been chosen better but you asked why a sand vs rain metagame is bad and I told you why.
Poor balance and low variety are not "accepted negatives". We do what we can to try and rectify this which is what we're doing. By banning rain, hopefully non-rain and non-sand teams will be more viable and can be used without being completely dominated.
Did I say these pokemon were gimmicky? Stop putting words in my mouth. I'm talking about actual gimmicks to stop rain that are being used on the suspect ladder even now. Stuff like cloud nine golduck/lickilicky, specific UU/NU counters like gastrodon and the things like the stuff in this post:
http://www.smogon.com/forums/showpost.php?p=3229438&postcount=515
for the sole purpose of countering rain. That's overcentralization.
The pokemon you listed are counters to some common rain sweepers but you need 2 maybe 3 of them if you actually want to stop rain. Again that's overcentralization. Am I forced to pick 3 out of a handful of OU rain counters every time I make a team?
What you do in battles means nothing. You provide a specific situation favorable to your argument where you've sacrificed your weather inducer only to find that your opponent is carrying a weather move. That happens 5% of the time. What about the other 95% of the time where you haven't sacrificed your pokemon and your opponent wastes a turn changing the weather only to have the weather instantly changed back. This kind of tactic wasn't used last gen when perma sand was the only weather. Weather moves are a new gimmick designed specifically to counter rain. That is overcentralization.
It's not about banning what's better. We ban what we think is overpowered or overcentralizing. Sand is clearly better than sun, doesn't mean we ban sand. Staraptor is obviously better than pidgeot, doesn't mean we ban staraptor so pidgeot can see some play.
Whether you agree with it or not, rain is a dominant strategy because it makes so many other things unusable if you want to win against it. It doesn't always have to be black and white, you win if you use it, you lose if you don't.
Um...no. +2 LO sandslash does 40.1-47.3% with stone edge because you will be running jolly or you get outsped by anything carrying a scarf. Not only is that not a 2HKO, skarm comes in on the SD and roost stalls you until LO kills you or phazes you out.
Bulky waters and dusclops have reliable to semi-reliable healing unlike nattorei who only has leech seed. And I don't care what you say but you're not sweeping anything with +0 sandslash.
Having a physical/special mix makes a pretty big difference. It's part of the reason why you need so many counters on the same team to stop rain. Sure Blissey can stop all the special threats, but then you need nattorei to stop the physical ones. Then what happens if they pack 3-4 physical threats instead of a mix and break through nattorei, you need another backup wall.
However I do agree with you that sand throw can still be threatening if they break through your wall. Which is why I'm not entirely against banning dory/sand throw but that's a whole new discussion.
Well landlos handles skarm. Plus you can run knock down on Dory or Sandslash as well. Bye bye cocky skarm. Not to mention it helps with Gliscor, bronzong, and others as well. True it is weaker, but it can also give you an extra set up opportunity as hey switch from their best counter to their second best.
Weather teams adapt to beat their best counters. Thats why specs toed has become its most common set, and most kingdra run either specs or at least LO hydro pump.
And if you want to run just 2 pokes to counter rain, I'd say roobushin/birijion+abomasnow. Nattorei is aboma's main problem in countering rain teams, and just allows roo to set up and take out 1-2 rain sweepers/politoed. Birijion works as well in theory, but I haven't tried it yet. Out of the two, roo is entirely viable in OU, and abomasnow is admittedly questionable, but it serves much utility outside of just rain. It disrupts other weathers, can threaten bulky waters well, can survive latio's draco meteor, and other things.