The Forums are never mentioned
Practically only the subreddit and twitter are cited as source for any D4 related things in articles and Youtube contents. Do people still read forums? Outside of the few thousands that are still here.
The support team uses threads created in the Bug Report forum to create internal tickets for the team. Unfortunately, if they were to reply to threads there, an expectation would arise that players would be receiving live, instant technical support, and that would not be scalable. Hope that gives a little more insight! 
Yes, we do, there is regular reporting that we send to the team and I do source plenty of it from here. Similar to the support team, I am not able to post to every thread acknowledging them personally, but I do read them all, and ensure that the community’s voice is heard. This doesn’t always mean a fix is easy, or that we can implement everything asked for (much of it conflicting), but it does drive changes that the team makes.
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