Maybe one feature suggestion: users could somehow respond to the ideas in a way that would enrich it. This doesn't necessarily have to be a comment. It can be something like an "counter-idea" or "associated idea".

I like the "associated idea" suggestion, will look into implementing it. Would make it easier to explore interesting topics and enrich the experience, like you said.

I was also thinking of "lists" or "courses". Users could make their own by adding ideas to them to address a topic or problem, and they could be private or public.

Might add simple comments as well as, but not quite sure yet if they'd add enough value.