If you're claiming there's consensus RCV with IRV is no good, you're going to have to show sources. Because everything I know tells me that's patently false. There's no such consensus in academic, there's no such consensus in the political world, there's no such consensus anywhere.

You say pretty much any other proposal is better, plenty of other people say the other proposals mostly look even worse.

I don't understand why you ascribe this to "hardheaded loyalty" instead of people just genuinely disagreeing with you, and that they have good reasons for it.