Who cares?
Where is the evidence that typical viewers (rather than technical enthusiasts) care about picture quality? They have never been much troubled by gross distortion in geometry, in luminance or colour rendering. None speak ruefully of 405-line TV.
Apart from the introduction of colour in the 1960s, of Teletext in the 1970s and recently of flat displays, the average viewer might not even have noticed. Other "improvements", like digital transmission ("Oh, it's digital, so it must be better") have been driven by advantage to the broadcasters, not to the user and by a desperate hope that the technology has not reached a plateau, where users no longer buy when a shinier version is available and showing off a TV is as naff as showing off a pocket calculator.
Biting the hand that feeds IT
