Not true. Some LCDs have very good black levels.
There are some VA panels that aren't terrible, but "very good" is a stretch. Some TV's have local dimming, but no monitor does, and every, single, IPS monitor out there regardless of price has
crap for black levels. The best ones out there don't break 1000:1 contrast ratio
and most have IPS glow in the corners.
Here's a question though. What else is your option? You don't have one when your current display fails. Few things bug me as much as someone bagging on LCD technology.
LCD has succeeded for numerous reasons unrelated to it's actual image quality (power usage, size etc), and I couldn't care less if that bothers you. Want to know what bothers me? Shitty black levels.
If plasma and crt was so great they wouldn't have failed and gotten discontinued. There are still a few crt models left out there but almost nobody except professionals that work in graphic arts want them.
The major downfall IMO was power usage. Efficiency and cost is king these days.
As a television technology, plasma went away because the industry comes up with some new way to market LCD's every few years. First it was "120 hz", then it was LED, now it's going to be quantum dot, all the while they still have bad black levels and poor motion and screen uniformity issues. Poor marketing killed plasma. Start up a convo about plasma with a typical person and you'll get questions like "don't you have to fill them up after a while?" and "don't they get dim really fast?" etc.
LCD beat CRT and plasma out due to every reason
but image quality. LCD's have been common place for 15 years, and manufactures
still can't figure out how to prevent backlight bleed. OLED can't come quickly enough.