You are definitely not the only one with this opinion. Personally, I like to see updates in Steam, since it's easy to access during the download. Plus Steam's systems help promote recently updated titles. So, if every update at least has a change log or something for Steam, I see no issues with copying it to the forums, preferably so it shows up under the NEWS section and not just the Patch Notes.
As far as CG responses to posts, I get that reading every posts to find ones that deserve responses can take a while. IMO, Discord has this problem much worse, but that's not the point. Assuming CG has someone expected to interact with the community, I don't think it's unreasonable to expect a new post to show up in the Dev Tracker every day or two. Even without reading every post to decide what needs responding to, just opening a couple recently active topics should give at least one concern players have that can be responded with an explanation or generic "we're aware of this and working on it".
For topics you notice pop up a lot, maybe consider offering an actual progress report on it. I get that the posts-in-the-forums person may not know the status of everything in development, but if you're constantly seeing users complaining about something like split-screen, maybe figure out where it's at in development and offer something a little more than the generic response. That's not to say you have to read every post. The bigger topics will have multiple posts, usually consistently staying towards the top of the recently active list.