Or, Mr. Only-My-Opinion-Counts, maybe you are. Unless you personnally intend to keep Cadillac afloat, I'd suggest you curb your attitude and remember you're just one little turd on a car parked under a tree in springtime. Grow up.
Comfort is very subjective. I'm sure there are plenty of STS owners who were very happy with the comfort of their vehicle. I found the seats flat and hard bottomed, and I didn't like the sitting in a bathtub feeling. The CTS, in my opinion, is downright cramped. Limited shoulder room, and with the curving dash, little foot wiggle room (though adequate fore and aft room). From what's been written so far, sounds like the XTS is similar to the CTS in that regard.
Touch screen dash? That's so 1987 Riviera. And the idea of a plethera of options with the system? Sometimes more isn't better. It's just more.
Yeah, like too much room and weight.