I think you're being dense on purpose, Roel. It's already been mentioned above. Clearly, if an RP can only be edited in private, and it can't be made public without full agreement, then that is an extremely light-weight way to handle it because there is no space-impact on the DB. No wiki-style tracking of changes is required, because if everyone doesn't agree to the changes, it won't be made public.
Thank you for assuming stuff against me - WA already mentioned he has to have all of them saved no matter if private or not, for moderation purposes. There is still chance of rule violations - if it was only about whether stuff goes to broader public or not, it wouldn't be an issue. But it is not.
To address your three points, deleting should only be available for the last post in the series. To delete up to a certain point, all participants would have to delete their own posts up to the desired point, one after the other. You don't want a swiss-cheese RP from random deletes, or mistaken deletes. Otherwise you would need full-editing AND post-insertion to fix that problem. But I've agreed previously, above, that last-post deletion & creation of a new post is a way to "edit" the last post, and is light on WA and the DB, as versioning and post-editing, and timed-edits are all not required for just that feature.
Mhm, yes, I haven't said anything about limit to what you can delete, but I fully agree that deletions being restricted to last thing posted are more than reasonable. At least out of 'Editorial' (because some things might need deleting while there too). Not sure, but I would suppose some storing even of deleted ones would be needed? Got to ask WA for that, but I guess it might not.
A one-time edit is light on implementation and the DB if it doesn't include version tracking. But whatever negatives we don't like, such as anti-social behavior, can occur in one edit just as easily as unlimited editing. Plus if you edit your post to correct spelling, then notice something more subtle, you can't edit it right then when you see it. And again, after you do fix your post, then suppose your partner fixes a bad leading participle phrase in their post and the result is it now disagrees with your subsequent post. Oops, you've both edited once, so no more changes allowed.
As said previously, edits have to be stored anyway, as WA said. Version tracking is lighter in this case just because it queries for 0-1 of edits only, not 0-whatever number.
It is not against anti-social behaviour and doesn't claim to be any better against it than unlimited. Thing is purely technical - as I mentioned, there are no things in such system that would be aimed against abuse.
I would argue that corner-case like this, based on not really communicating/asking is a bit... well, weak of an example? Especially since you should be able to delete the post then, to get a proper version online.
What kind of 'free' editing? Or how free? The RP creator gets to edit all posts? Each person, if they care, may edit their own posts? Again, if you can't trust people with more than a single edit while the RP is in progress, what is the logic of permitting it afterwards-only? Is the change to "Editorial" mode a final step that can't be reversed, or can the RP be freely advanced to this mode, and then set back to In Progress? I'm really just not getting the reasoning for trying to do it different than a straight forum where there is no versioning, and the hole thread is freely-editable, until maybe it gets thread-locked.
Free as in unlimited in number and, addressing what was said above, where posts could be deleted, possibly? (to clean OOC for example; maybe allowing to delete only OOC no matter the place?)
It is not about trust, once again. I am not sure what is exact reasoning of WA about why unlimited can occur here - question to him. I can only guess that maybe once it is concluded we don't expect any rule-breaking and can be more lenient on archiving.
No, Editorial should only be able to be progressed into Finished RP where nothing can be posted/edited anymore.
Keep in mind some of these are my guesses, I only know as much as I asked about.