Does Infuse sync the ‘collected’ status of media with Trakt?

And if not, then is there any plan to do so in the future?

Not at the moment but it looks like it is on the list for the future.

This seems to have been on the docket for a while now. I can see posts all the way from 2016 where this was mentioned as expected.

Unfortunately there are a lot of things that have been requested for a while. Generally they tend to focus on performance and quality before adding new features.

Hmm…got it. Does Infuse publish any public feature/bug tracker?

There are the release notes and the other forum. Otherwise nothing public.