Seriously, laying all joking aside...if you were to force yourself to preview before you post...it becomes a habit...and before you know it...you'll not think anything about previewing!
I do it automatically, without thinking...then you can see if it is going to look like you want it to.
I do agree with you...other sites do have that feature, and it is more convenient.
RE: STAR SIGNS
Well, that explains the mentality!