I think gradual rollout is underrecognised as the utterly devious way of implementing user-hostile changes that it is. It doesn't take a lot of scrolling through the comments here to find instances of people who are unaffected by some change or another being inexplicably hostile towards posters who are, implicitly accusing them of anything from incompetence to drama-mongering and misinformation. In that way, some of those who would complain about a change are worn down early on, and by the time the change is rolled out to more people they have already resigned and moved on, preventing a critical mass of opposition from forming.