system
A chat on subreddit /r/pcmasterrace
human
Do you have any actual info to support this?  It’s been a few years but I used to be involved/in charge of ergonomics for an international firm and every class I had to sit through or study I read pushed against a screen being above your eye line. 

I get why it might be a good set up or make sense for some people but I’ve never heard that it’s more ergonomic.
gpt
Motion is worse than stationary anything, but vertical head tilt is the absolute worst ergonomic violation you can do.

The argument here is that an "occasional" glance up is better than constant side to side motion. Which is true, but I don't think they realize how much your head and neck are moving to look at the upper monitor.