Yes, PWM is another big issue. I'm very sensitive to it. Even though I grew up with CRT's (or perhaps because of that).

Luckily my display doesn't do that. It's also very hard to figure out through reviews so I'm glad it doesn't.

I was thinking about such a filter. But I haven't seen them for sale, I just know they exist (I was thinking about ND filters used in photography). But I wasn't sure if they exist at this size.