For two reasons I'd like the personal statement to be made draftable i.e. you could save it and at some point and it's private, and then make it accessible to others later:
It's possibly the longest bit of writing you'll do on the profile, and you might want to take several attempts at it before letting someone see it.
To do this, I just left mine sitting there open, and of course I was asked to re-login on post, which promptly lost it.
Keeping another copy offline to work on until I'm ready to paste it into the box and post seems very back in the day and not very Stackish. Some will say that you'll probably take it from your CV, so it's a copy and paste job anyway, but I don't approach my profiles that way. Each one may be unique and tailored for the place (as in job site or agency) it will be used. StackCareers is different to many other careers sites, for example, I don't have to mention my Github repositories in my personal profile because they're listed. I don't get that option on a site like Reed, hence my personal profile is different.
So please, consider making it draftable.