Why not? Why shouldn't we encourage all possibilities? I think it's foolish to make something so customized that it only fits a single purpose or is just plain artificial. That's not what Game Freak does.. and why should we emulate anything other than that? That's exactly what happened last generation. CaP got ahead of itself and rather than allowing things to settle and piece together, the community forced things to fit. It didn't work well. We created a game that could very well be completely independent of other Pokemon, with CaPs being clearly superior (standalone) than the majority of other Pokemon. We should be more clearly emphasizing what has already been provided to us instead of making up a bunch of shit like the CaPs before.
Are you saying we should forgo the concept process altogether? We're supposed to be learning something from these projects, not just putting in a pokemon that does an ok job in Ou. Your concept is not bad by any means. If we could make a pokemon that supported Ninetails, Politoed, and Abomasnow, we would learn a lot about which weather was better. But let's take a look at that task:
Ninetails would want protection from rock moves first and foremost, stealth rock being it's biggest problem, wish and rapid spin support would help it. Ninetails is the most frail out of all the weather starters, so it would appreciate Light Screen or Reflect too. But then again, a lot of pokemon would like a partner with good bulk, rapid spin, wish, dual screens, and resistence to rock.
Politoed does not have the same problems as ninetails, due to having better defenses I've seen it take T-bolts like a champ. Perhaps it misses out on reliable recovery, but it is a solid contender. Wish support, a partner with physical defense, and maybe an electric immunity. Reflect could be useful. However, I'm sure that other bulky waters would enjoy the wishes and defense boosts as well.
Abomasnow has decent bulk, but horrible typing, being severely weak to fire, steel, fighting and rock, which are all over the place. It would definitly need a partner to counter fire attacks, which could be accomplished using flash fire. Most hail teams tend to run Heatran though, and I don't think we want Abomasnow's support to end up as Heatran with wish. Again, dual screens would help it set itself up for possible subseeding, and wish would relieve the damage from wood hammer. Apart from that it needs a partner who can take down scizor, along with fighting types and users of stone edge. Froslass takes care of the fighting types for hail teams, so that isn't major, but a resistence to rock, fire, wish, rapid spin, dual screens. Pretty much everything Ninetails wanted.
So in the end we end up with something similar to a Defensive Heatran with a Support Movepool. I'm sure there are othe possiblities for typing, but something tells me that it will end up as a defensive support pokemon, and those screens and wishes are going to be able to help better pokemon than these three. The problem is that none of them resist fighting, and one is weak to it, meaning we can't exactly support them well if our poke is weak to it. Meaning it has to be at least neutral, meaning it could probably be used to support T-tar.