To my mind the LS 400 Mk4 has everything you really need, a decent seat, great gear box, hardy engine, good build, electric mirrors, traction control, CD player, even a cassette deck etc etc.
The only thing it could do with is some USB ports and a MP3 input jack for the all the gubbins we now have.
I have no need of a fridge, or massage seats, or on board TV's and so on, just adds weight and more stuff to go out of data/break.
Maybe in the future we will have cars with on-board log fires, personal gym, four-poster bed and saw horse - to name a few - but I will still feel I have everything most sane drivers need when I will still be pottering about in my Mk4.