I also dream for this. Personally I would remove likes/reactions though. As we've seen with Instagram it's too easy to chase that dopamine rush/compare number of likes. Comments are enough in my opinion.
And comments should be disabled by default. Users should have to take the extra step to enable comments ("I would like feedback") and if they're off by default, it won't feel strange or negative to the viewer.
The best online discussions I have seen where at simple forums where the posts were listed in chronological order without likes or anything.
I don't expect to learn much at all from internet discussion at this point. It serves a minimal socialization purpose and then my actual learning is from books and language models.
I actually had a moment just yesterday, imagining/hoping my toddler daughter will grow up and refer to my phone in the same way I did with my parents cigarettes when I was a kid. My mom always claims she had no idea they were dangerous when she started as a teen. I wonder if we'll all sound the same with social media and our devices to our kids.