...and, I think that the 4500 character limit includes spaces (does it?). Most applicants will probably get 700-750 words out of the 4500 character limit.
This is actually probably a good thing, although applicants may not see it that way. Keeping the statements shorter will help adcoms to not fall asleep, and it also forces the applicant to write about the most important information.
I've always informed people that an 800 word essay is the best, because it leaves a nice big white space below the essay on the AADSAS form. That white space is pleasing to the eye and looks much better than the entire 1000 words crammed into a space (on the old AADSAS forms 1000 words took up the entire available space).