Well, when you target Windows or Mac it's a mess anyway: when your project reaches certain level of complexity then you probably build Qt alongside with it.

But I think that adding friction to the "download binaries from some site" is doing nothing more than alienating Windows developers. Qt just must add something like "Sign in with Google/Facebook with one click" because this audience cares about convenience.

Don't those platforms have their own package distributions? macOS has homebrew, and I hear Windows has a few.