For what it's worth, I've been overseeing the development of https://thoughtliner.com

Perhaps the most developed demonstration is at https://thoughtliner.com/thought/11 (click on the button to show responses to see more).

The site is maybe 50% of what I would consider MVP, but work on it has been mostly dormant for the last several months. A more serious effort might resume in 2022.

I started working on it because I thought it could help me organize my own thoughts. It could be a useful resource for people, but I also think the interested audience would be fairly niche. As you dig into various arguments, the topics can easily become fairly esoteric or technical.

If you have interest in it (e.g. you have ideas to contribute or just want to be informed of a "launch"), you should be able to reach me at support@ the domain.

I’ve had this same idea too

What if there were a “structured arguments” wiki

Each topic could have some tree structure, like side A has a list of points, click each point to see side B’s reply

Reducing debates down to their atomic points without all the fluff of reading a flame war thread

Everything must be written with the clarity and succinctness of Wikipedia including sources

It's not quite the same, but I feel the Talk pages on Wikipedia are often overlooked as a source of interesting debate, related topics, and other curiosities.

Especially religion and politics.