Probably to some, but I can't see it really. I've tried things like that in other RPs and it's broken apart really fast. Usually when someone that assumes an important role doesn't post for one reason or another. So fundamentally you'd need writers who you know will be able to write without complaining they can't write anything to their stylistic satisfaction.

But also on some fundamental story-telling principle you need some manner of character establishment. Some starting point that establishes a character's norm and their personality. This will serve as the basis of that character and as a comparative point as the story moves and they evolve as a person. A hot start for all characters may fundamentally remove this aspect unless it can be handled creatively and organically over the course of the story.