I'm not asking anyone sort the existing posts just make a new empty category for Pros going forward and leave the old one alone.
I wouldn't waste time going back.
Just make a new one with the new rules in place from the start and ensure everyone knows that's how its going to operate.
I mean if these new rules go into the old category you'd either have to do the same thing or leave the old posts alone.
I'd rather give people the option of using the more free-form category if they prefer or feel uncomfortable sharing details. (Sure you and I know there isn't any harm sharing ideas, but I think everyone is entitled to their view on that. I'm not sure I'd want to forbid collabs where they refuse to share details publicly.)
Leave the pro section for the well organized and preferably paying.
CastingCallClub does something similar for independent video productions.
Now I'm currently right in the middle of a collab that came out of that section of the forum and its going fantastically and I know if these rules had been in place I might not have bothered posting it because at the time it was an undercooked idea I wasn't sure was worth developing. Still I found someone enthusiastic to work on it and through mutual trust and hard work we're very close to revealing something I'm damned proud of.
If my half-assed post had been shut down out the gate that one-shot would never have happened. It's why I'm taking this personally.
If that sort of semi-off-the-cuff idea pitching is no longer welcome in collab then I have little issue never using it again. I just feel you'd have thrown away the things that did work about it.
Maybe I'm the only one who doesn't feel like dancing around eggshells every time I wanna pitch an idea but I'm not 100% confident in it.
If I knew I'd effectively to fill out a form every time I had a stupid idea with potential I wouldn't have become a writer.
I wouldn't mind if I was ready to commit to the project but if I was I'd not be in collab looking for warm bodies, I tell you what.
Look I have no idea these will be enforced and that's the problem, I have to worry about without knowing so I'll feel like I have to jump through every hoop just so I don't have to go back and start over.
All I want to is advocate for a place where people can pitch ideas without feeling like they have everything figured out in advance because that is a tomb for creativity. (Plus how much of a collaboration can it be if its that far along and key members are not on board yet?)
Both styles have their positives and pitfalls and doing both feels like a decent compromise.
Maybe consider opening the new branch just as an experiment? see how they work alongside each other then re-evaluate.