You’d need much lower than 72 hz for you to notice flicker. Regular VGA was 60 hz. Amiga interlace had noticeable flicker with an effective rate of 25 to 30 hz.
* Hitachi 21" CRT which seemed enormous at the time
The Amiga interlace flicker was bothersome to me. When I got an Amiga 3000 with the built in deinterlacer / flicker fixer, it was like night and day...