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.
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".