Waste of my time, so I'm going to respond to each block of text in one sentence.If you had actually payed attention to my post, you'd have figured out that a whimsicott with sunny day/rain dance/thunder wave/encore can not only be used to change weather, but also shut down stat-uppers and cripple. It has encore and thunder wave too and can use them just fine.
A pokemon like blissey doesn't mind sandstorm because it's already a massive wall to begin with, but there are other walls (gasp, using other defensive pokemon besides blissey and skarm?) who need the leftover recovery to really shine defensively. Scrafty comes to mind. A bulky scrafty without leftovers dies a lot faster than one who has leftovers. And yes, it cripples sweepers too. In fact it's just bad news for any pokemon who's not a ground, steel or rock type. I don't see how that's so different from other weather conditions. The goal of a weather team is to empower certain types at the expense of diversity. Like I said eariler, if you are running a sandstorm team, no guesses as to what predominant types are going to be in your team. The minute your opponent sees you have a weather oriented team they know to expect excadrill/ninetales/kingrda/whatever and that in itself is a weakness, even with team preview.
Just because you don't want to run a counter to something on your team doesn't mean it's omnipotent. Stealth rock requires a spinner to get rid of it or else it will haunt you through the entire match. Using a spinner in my opinion is far more irritating than using a pokemon who can change any of the four weathers to something more suited to your tastes and also run other services while it's working. Why would you want to use abomasnow anyway unless you were making a hail team? Abomasnow can't stop attempts at stat buffing with priority encore, nor can it thunder wave specific threats who require the speed boost from swift swim/cholrophill to be really scary in the first place.
If rain is so ridiculous then why was it considered inferior to sand last gen? Regular set-up rain and sun teams just didn't cut it. They were considered gimmicks. Why is that going to change now if drizzle is banned?
That Whimsicott is useless.
Scrafty as a wall is just terrible and deserves to die easily, especially when there's Ferrethorn, Gliscor, Hippowdon, and even Tyranitar that can be considered walls.
Why would I encore when I can spam Scarf Blizzard, Superpower, Wood Hammer, and something else?
Because Drizzle Politoad wasn't around last gen?