The Agile framework is often used in software development, but I think there are elements of this framework that you apply here: intentional experimentation, fast iteration. I will be keen to see how the new format goes.

I think for me, by the time I find a prompt I can relate to and rack my brains responding to, I run out of brain space to read and digest the rest of the prompts. Also, it will be quite hard to follow the chats that are ensuing in the more popular prompts. So I think one prompt = one post is something worth trying out!