I voted for forums only, but only because answer hub feels abandoned for years now. Your main issue is abysmal documentation and lack of actual involvement in the questions.
When I want to use this or that, instead of documentation, I go through the code and search for random forum posts or videos ( including yours). Then I try ro use it and find 1001 issues (currently fighting with the physical asset).
I don’t know where to ask (have more success on reddit or discord), if its something stupid no-one can just point me in the right direction (see the documentation issue) and if its more specific, the right people won’t ever see it…
To add to it, I can also find dead wiki links - so about half a year ago. someone has pointed me to a save system in unreal (cpp side) which was really simple to use but that documentation was on some backup of said wiki… I didn’t find anything official about it anywhere… how is this fine with you is beyond me.
When I was frustrated, i’ve tried Godot and Unigine - especially the second one was poetry. Nice, clean, modern documentation and their staff is active on forums. I was able to take their engine and “just make” a hackaton entry only because of this.
Your involvement - with constant update of the documentation based on questions in the forums is what’s needed, not a new platform.
PS: StackExchange rulez and your reasons don’t affect “us”, they feel “egoistical”, so to speak. Its also a great concept that isn’t that hard to implement on your own, if you actually tried.
PPS: Just read this post of mine here: https://www.reddit.com/r/unrealengine/comments/k7agol/any_tips_for_good_referecne_resources_books/ I truly am frustrated with it…