Thinking about this, I'm not sure a withdrawal of the RSR is the right thing to do. I get it that millions of people who (sadly) still use Facebook et al will see compatibility warnings in their browser when visiting these sites after installing the RSR, but the problem here isn't with Apple, it's with the crappy parsing of user agent strings on those websites. Meanwhile, those of us who want the RSR and don't care about Facebook or whatever, now can't get that update. I've installed on macOS and iPadOS but I didn't install it on my phone in time. Now I have to wait until a new RSR is released because of a (knee-jerk?) reaction by Apple. Probably won't have to wait long, I know. But maybe give users a choice - tell them about the effect of the RSR and let them decide.