Ok here is a better guess for the reason: Until recently Thor installed the Jensen JRV-212 in all the Vegas/Axis units. The 212 cannot playback a DVD and thus has no video out to connect to a second TV.
When they upgraded the radio to the Axxera they probably just made enough changes to make it work without realizing (or taking advantage of) the extra features--ok yeah so my initial joke is probably accurate: laziness.
When I did my upgrade to the JRV-215 I noticed that it also has controls and outputs for a 2nd video display. I had briefly thought about connecting that to the TV above the door but I was hindered by the same thing Thor was: laziness--I simply didn't have the ambition to run video/audio cables from the front radio spot all the way up inside the walls to the TV (it probably wouldn't have been that bad: run the cables up the passenger A-pillar which is quite hollow and then through the roof to the TV).
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