It's a strange notion that double posting is considered poor form in the first place. What if I have two unrelated things to say? Doesn't it make more sense to split those ideas into two posts?
Honestly who would care if I replied to a post 11 times with 11 different unrelated ideas?
Parallel, asyncronous communication is a thing to be embraced, and I would go so far as to say that we should just have massive mega posts years old and thousands of comments long about common topics instead of starting new ones whenever we have something new to add.