but I can't see that people deliberately trying to be obstructionists have any legitimacy
Sometimes obstruction is the only leverage in an asymmetric dispute since this is ultimately about politics between Brazil and the US. Presumably the US gov doesn't care enough to offer a worthwhile quid quo pro to Brazil. I have some sympathy with ICANN ducking the issue until the underlying dispute is resolved. Maybe I would feel differently if it were a another organisation caught in the crossfire other than amazon but it's hard to see how much actual pain this causes them even if I cared