Almost all plasmas have a decent AR filter.
Gorilla Glass is expensive enough and the benefits clearly perceived as small enough in the market that virtually no TVs have it. It's a shame, but that's reality. It would also be nice if every car on the market had 12 airbags and the stability / traction control of an Audi, but, again, it would be expensive.
As for the white wash stuff, I doubt anywhere near 5% of people ever use that feature. Improving it won't sell anymore TVs, even though it's a good idea.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.