Yes this a (computer) CRT thing. The commenter might be misremembering the exact numbers, 60 Hz baseline is a flat panel thing, by the mid to late 90s, 75 Hz was something a typical computer CRT would generally aim for and was part of various standards and recommendations.
I’m fairly confident I remember the numbers right. And VESA DMT indeed has 1600x1200 at 60, 65, 70, 75, 85 and 120Hz, and IIRC my old CRT would sync at 144Hz as well with somewhat dubious performance.
It's so many things, starting with the North American electric grid, NTSC, etc.
Yes my graphics card + monitor could theoretically run at more than 60 Hz. When I got to choose between resolution and refresh rate, I picked resolution. Hence 60 Hz.
