[bb88]

Apologies for not seeing your post until just now.

Back in the day, The multi-sync CRT's would sync VBLANK[1] to the power line if the screen was at 60hz. If a fluorescent tube overhead was also 60hz, the flicker became unavoidable and caused many an office worker a migraine headache. To avoid this issue, graphics cards and monitors started syncing at 85hz.

With an LCD panel at 60hz, the backlight is not flickering, and the screen itself is not vanishing off the display like it is on the CRT.

The reason to use 120hz and higher these days is to prevent motion blur. [2]

[1] https://en.wikipedia.org/wiki/Vertical_blanking_interval

[2] https://www.cnet.com/news/ultra-hd-4k-tv-refresh-rates/