Being able to go above 60 FPS but not needing to hit 144 FPS constantly is an advantage from a budget perspective (and also allows you to increase image quality settings). I find low FPS very noticeable (I hate watching sport on anything but broadcast TV since essentially every other source is 25 FPS instead of 50 FPS) so I try to keep everything running at 60+ FPS but that's not always possible (one fight in Divinity: Original Sin 2 drops to ~15 FPS for example). It's pretty obvious when I drop below 57 FPS and LFC kicks in too.
Playing games, particularly FPSs, at 100 FPS or more is a fantastic experience and I wouldn't ever go back. The only way I'd accept a setup without adaptive sync would be if the GPU was powerful enough to pump out 144 FPS using V-Sync on a 1440p 144 Hz monitor (or better), whilst retaining reasonable quality settings. Right now that's either impossible or stupidly expensive.
Vsync add lag. I rather have 100hz and Freesync.