The process to get a major change for Rust is:
1. You write up a proposal. We have a template so that you get the structure right and some general prompts to help you ask the right questions.
2. You can post it on the forums, as a "pre-RFC." This is like a vague temperature check from anyone and everyone. Nobody is required to pay attention to these, but it can be a valuable step if they do. This step is optional for everyone involved, you can go straight to step 3.
3. You take your proposal and submit it as an actual RFC. The teams are required to pay attention to these, and they either accept the proposal, reject the proposal, postpone the proposal, or give feedback designed to drive the consensus of the team towards one of these states.
When people say "the team is ignoring threads," they are referring to threads that are in step 2. Most discussions aren't full proposals yet. And they generate a lot of discussion. And then people never move to step 3. Those that do are guaranteed feedback from the team in some fashion.
Your initial edited comment:
> that still leaves the question of why they [edit: the crates.io team] haven't made such a RFC
Nobody is required to make an RFC for anything. If the team doesn't want to write one up, they don't have to. It's on the advocates of the feature to start the process, no matter if they're on the team or not.
> [edit: and told people commenting on the forum threads to instead comment on the RFC, where the crates.io team can evaluate] yet.
They didn't say "comment on the RFC," because there is no RFC at that stage. They said "please make an RFC." This is the same process every single major change to Rust goes through. It's pretty standard. The vast majority of people who desire this feature never actually do it though, because they tend to post on the forums, get a ton of comments from people, and then burn out, it seems.
I hope this helps. To be honest this thread is so old I'm likely to lose track of it and not reply further.