ok, i can agree with you on the edit or deleting a post.
But there was a basic features like quote or multi quote messages in the locked threads that were very useful for users in vbulletin. Here they can't do really nothing, edit/delete/quote or multi quote in a locked thread.
I think that there are more things to improve here. I know, to you it seems like a mandatory thing: "it must be in this way, stop". but it is precisely with this mentality that we go out of fashion.