For me,
it's hard to attend to so many different things in the comment tree of one post; and if you're following one or two of the prompts, you may not have time / desire to follow ten.
The above applies. I find a prompt I'm interested in, start thinking about it, and stay focused on that thought. Of course, there are other things going on in real life and SN, so I tend to get distracted. I will say, though, that I do enjoy wandering back in hours later when my enthusiasm is renewed.
So, I like your new idea.