That plug is high like that so it’s easier for televisions to be plugged in.
We all know how much of a hassle it is to plug in TV’S with a stand almost entirely blocking the way of the plug. That plug height eliminates the problem. And it’s also a good call for the coaxial out being the same height. It’s a pain screwing in the cable while bent.
tl;dr: It makes it easier to setup TV’s.