While I'd like to point out that in no way is this decision focused solely on OU, I want to clear up that I wasn't using Zoroark as an justification so much as just something to mention on the side (hence why I said "but that's just one pokémon"). Sorry for the misunderstanding.
Yeah, while I've had some experience with competitive ladder and wifi clause I've never really delved deep enough to have a clear understanding of it, so thank you for your point of view.
My reasoning is rather short-sighted to me, now that I look at your argument, since prediction and positioning is half of any battle and Wifi Clause assists that, regardless of whether or not a Pokémon has variance in it's moveset and options since just because you see what they're using, doesn't mean you're immediately going to be able to act to defeat it. I still feel it has some impact on these cases but you raise a very valid point.
EDIT: On a side note, since I still feel some people are thinking that this indentation of Team Preview applies universally, I'd like to point out that Wifi Clause is still optional in battle menus and so people can enjoy No-Preview battles without there being an actual No-Preview tier. Someone probably pointed this out earlier, but I feel like some people here still think you can't play No-Preview without there being a tier for it if Team Preview is implemented into ladder, so I just wanted to preach to the choir.