That’s just a workaround to share the draft with other staff members. Not what I meant though 
(and not usable or relatable to what I’m explaining above)
With shared drafts you need to mention a specific category as the shared “category” and saving the post to it so others can view it.
That’s bit worse than my workaround tbh, your suggestion makes it more disorganised and involves another extra step
But nothing solves the root cause that I explained.