Enabling gsync can be quite a different experience depending on your desktop and compositor, sometimes you need to apply fixes to get it to even enable as I found out with GNOME which was forcing everything to blitting mode (no setting fixed it, need to recompile a fixed mutter and shell).
XFCE WM basically prevents gsync from working, same with compton, plasma5 kwin worked without much problems however both XFCE and KWIN would crash the desktop if enabling vsync option in games. Under Gnome I can use vsync and gsync wihtout crashing (needed or games tear the screen to hell and back!)
GSYNC IMO needs allot better desktop compositor support, (inc vsync freeze fixes), multi monitor support like how it works under windows (I know this is a xscreen issue, maybe parts of it need to be reworked to allow vrr multi monitor support).
Also it be nice to see fastsync and framerate control make an appearance in the nvidia-settings control panel sometime…
This is probably all too much to ask from NVIDIA since Linux is likely a pretty minimal piority for them… can always hope.