What is the advantage of LCDs then? Because if plasmas are better in every way, why would people get LCDs?
It costs more to make Plasma. So they pushed LCD.
Plasma did have issues with screen burn-in (image retention) in the early days, but that's not been an issue for years now. But it was an issue for long enough that people still think it is.
Mostly, they pushed LCD because the made more money on them.
If you buy a Plasma at any price level from Samsung (or Panasonic when they still made them), they crapped all over any LCD at the same price level. You have to spend considerably more for an LCD just to get "almost" to the Plasma's picture.
But for whatever reason, the advertising and loads of different levels of LCD's has worked, and people buy them. Now we're stuck with that technology....just when the best technology had gotten to a really reasonable price, they've quit making them, and once Samsung quits making Plasma, we're back to spending 4k or more to get the best picture.