They usually choose a subset of customers to try UI changes on before rolling it out to everyone. This way they can estimate the general reaction before committing to it. They probably also have a dozen different layouts and text for this dialog that they are testing to see what makes people most likely to click yes. Its all just statistics to them.

Yeah, automatic posts drive me away faster than anything. Good point on cross posting though, I just followed your advice. It’s pretty much free if your post fits in multiple places and there are lots of nearly empty communities right now.