Why are there no tube televisions anymore?

Don't you have any 'black crush' in the dark scenes? :)

Cable lifters ARE necessary because of the Geocentric seismic waves caused by the Globe earth spinning 1000 miles per hour!🙄

Well, when I brought home an AQ Niagara power conditioner to audition in my Stereo I decided it was a keeper.  I had been using a Furman Elite 15 PF i power conditioner.  What to do-so  I put the Furman in the Home Theater system which has a few months old Sony XBR LCD TV.  The Furman made a striking difference.  The colors on the TV are much richer now.  I marvel at the picture every time I watch TV now.  I use some mid level AQ HDMI cables but do mostly streaming these days.  (4k blu ray easily outshines 4k streaming btw) I had thought about a better power conditioner for the home theater but was not as motivated to spend the money like I do on the stereo system.
About tube TVs:  Some reminiscing about the late 1960s.  My dad brought home a Philco 25" color TV in the late 60's.  It had the best picture that I can recall on any TV until 4k.  For real.  I can remember seeing Star Trek on that TV in the late 60s.  I noted to myself a year or two ago that it was not until these 4k TV's came along and the original Star Trek series was remastered in HD did the picture finally look better than on that Philco TV.  It took nearly 50 years to get a better picture.  Remember, Cable TV had the worst picture.  It might have looked clear but it was grainy due to overdriven signals.  Then TV's got bigger but the resolution stayed behind.  The only downside was that Philco TV ate tubes.  I remember often going down to the drug store to test tubes because the picture would either lose its color or go out completely.

Visual differences are easier and more objective to describe and demonstrate.  Audio differences are much more subjective, and vague.

Tube TVs are ancient history.