Earlier quoted context omitted.
XFCE is saddled with its GTK requirement, and GTK gets worse with every version. Even though XFCE is still on GTK3, that's a big downgrade from GTK2 because it forces you to run Wayland if you don't want your GUI frame rate arbitrary capped at 60 fps. For people wanting the old-fashioned fast and simple GUI experience, I recommend LXQt.
What use is there in display frame rates above 60 fps?
On a CRT monitor the difference between running at 60 Hz and even a just slightly better 72 Hz was night and day. Unbearable flickening vs a much better experience. I remember having some little utility for Windows that'd allow the display rate to be 75 (not 72 but 75). Under Linux I was writing modelines myself (these were the days!) to have the refresh rate and screen size (in pixels) I liked: I was running "weird" resolutions like 832x604 @ 75 Hz instead of 800x600 @ 60 Hz, just to gain a little bit more screen real estate and better refresh rate.
Now since monitors started using flat panels: I sure as heck have no idea if 60 fps vs 120 fps or whatever change anything for a "desktop" usage. I don't think the problem of the image fading too quickly at 60 Hz that CRT had is still present. But I'm not sure about it.