We're going to be reopening some things with read-only access.
To clarify why we did this - the volunteer mods have enough on their plate, and we tend to get more constructive feedback from reddit and discord, they're easier to navigate than the forums, easier as well to moderate, and have more users on them.
This also isn't to say that the feedback on the forums was "bad", but the difficulty of navigating it (threads getting necroed, no way to filter more popular ideas, etc.) as well as the smaller amount of users lead to it just not being as efficient for us to look at for feedback, and your ideas were less likely to be seen over there.
The forums served its purpose in the pre-alpha, alpha and beta stages of the game, but now that the subreddit and discord are very healthy, it's better for us to consolidate the community into less platforms.
EDIT: To clarify, we just hid viewing access - all old posts still exist.