Another victim of the form factor "diet"
Has been the ability to drive a signal any appreciable distance. I have old(er) machines that will drive a 35-50' HDMI cable All. Day. Long. Forever. The bevy of new Ulltrabooks now have a hard time doing 10' on a good day with a following wind without external amps, sometimes failing to even put out enough oomph to drive a wireless HDMI adapter that's connected through a measly 3" cable to a level that the receiver won't just give up on after a few seconds of trying to link.
Give me a few MORE mm/grams and give the damn chassis some more battery, a half a volt more output on the video and a wireless card that isn't anemic and I'll be quite happy to support it. Too many things run on the edge of "working" at this point, just to get the willy-wagging rights.