Yeah, I agree :o though, I guess a counter argument for this could be that since SpaceHey is a retro site, the lack of notifications and users having to manually check the forums themselves are just what makes SpaceHey...well, SpaceHey.
Still, I think having a section/notification for participated forum topics wouldn’t be so bad u_u
Even PHPBB from the 90s had forum notifications for topics you were a member of. I don't recall if original MySpace even *had* forums, but that may be why I didn't use them but did use PHPBB forums.