Mew is blue
Ok Seriously in my opinion this metagame stinks.
First of all, SR hasn't promoted the huge amount of diversity that I was told to be expect by the pro-ban side of the arguement. The banishment of SR has really only served to promote the powerful threats that were weak to SR in OU, which are some the best Pokemon in the game. I just e-z cruised my way to #11 on the ladder with a dragmag team consisting of politoed - dragonite - tornadus / kube - garchomp - magnezone - and latios. SR puts much more pressure on offensive threats than defensive threats when it is implemented because defensive mons in an SR metagame since the best defensive typings resist or are neutral to rock anyway (steel, ground, water, poison; not ice and fire). It also serves to promote weather because weatherless' best mainstay in HO with hazard leads is gone now. You can chose to run a. sun / rain to preserve your own focus sash's, preserve multiscale, or use offensive fire-type for sun or flying hurricane spammers for rain OR b. Sand / hail to break opposing sashes / multiscale, prevent fire-types/hurricane spam from being out of control, and (in hail's case) use offensive ice-types.
Regarding the bolded part, you're vastly underestimating the impact SR has on defensive pokemon. Offensive pokemon, generally, are not looking to take many hits, if any, depending on who you're talking about. While SR is naturally going to make their survivability worse than it already is, SR doesn't stop them from performing their function, denting holes in the other team, when they get the opportunity to switch in. Defensive pokemon are usually going to be switching in multiple times in order to keep offensive pokemon at bay, and SR damage builds up very quickly, even if it's resisted. The large number of pokemon who have access to SR combined with how much harder it is to keep SR as opposed to how easy it is to get them up makes defensive pokemon/teams suffer much more than offensive pokemon/teams. Congrats on your ladder peak, but you can just "e-z cruise" your way to a high point in the standard ladder with almost anything, so please don't say something like that as if it supports your opinion that a meta with SR is inferior to one with SR.