Well, that entirely depends. You made a really strong claim, and those are worth taking seriously. But that doesn't mean that a response might come out that way. For example, if someone claimed that using four spaces instead of two spaces for indentation is "completely broken", then "that's just your opinion" is a pretty acceptable response, in my opinion.

But, I can assure you that Rust is most certainly not perfect, and that we roughly try to prioritize work alongside what people ask for. Part of what I do is gather this kind of feedback, so that I can tell the rest of the team "Hey, lots of people have started asking about x. Maybe we should try to bump x up in the schedule." And we do do that, though obviously, everyone has a pet feature, and you can't satisfy everyone. (My pet feature that's far off: HKT) But I can't take action against "hey someone on HN says Scala has some secret sauce and we suck, but won't divulge the details."

It's not your job to help us improve Rust, but making really vague negative claims doesn't help anyone, really.

We're all here to exchange each other's opinions. If you don't feel like listening to others' opinions, why are you here in the first place?