In both cases there isn't really an issue with the screen and the data not matching. The television picture or data in both is not definitive. There is a reason why you have separate seonsors of data measurements and don't rely on the pictures.
The rule makers are relying on information other than the pictures for precisely the reason you say. So they have accurate information that isn't ambiguous. Good choice by them.
Unfortunately that isn't going to satisfy some, but then you ain't going to achieve that. Ever. For instance Vettel is never going to accept it.
Sport and the world is full of this stuff. Things happen, it can be shown it happened (or didn't) and people still don't get it.
Edit. Man who gets it:
http://www.autosport.com/premium/fea...tas-jump-start