Primarily. But the other avenues are monitored as well, especially the official ones.
That’s all under the purview of the community managers. Of the myriad of duties they have, one is to collect feedback and create reports that are passed on to the game designers.
To your point about having something… anything that gives the player a feeling of retention, yeah, that seems like it would be helpful.
That goes back to the consolidation point. Not so much that feedback isn’t being taken, just that it’s being taken in a different, consolidated location.
But like I mentioned above, even a quick message letting players know where to go for feedback, or something similar, would be smarter.