Burned-in screens were standard when I started with computers, though
towards the end of the CRT era it mostly didn't happen any more, and
more modern monitors tend not to do it either.
But that doesn't mean it's gone away. Here's the VFD on my 3D
printer, clearly showing dimming from the "Time left" indicator and
some less-visible text below. (The dark band is from temporal moiré
between display and camera shutter.)
It's still usable, of course. Maybe they don't expect people to use
them quite as much as I've used mine…
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