I know this might sound sumb to some. But I have a freesync monitor, so as long as I stay within my freesync range, I should still be completely tear free, even with V-sync disabled, right?
I'm on KDE and setting software cursor via KWIN_FORCE_SW_CURSOR=1 fixed that for me in games like PoE where the cursor began to lag heavily if there are fps drops from like 144 to 90. If you need hardware cursor KWIN_DRM_NO_AMS=1 should also help.