Android Q kills its default gesture navigation if you install a launcher like Nova

With the ever-increasing sophistication of manufacturer overlays and stock Android itself, third-party launchers that were all the rage when Android was young and silly, are now slowly going the way of the dodo bird. Or the koala lemur, or the giant bees, you catch the drift.
Thus, you are left with the gestures of the third-party launcher which, for all their variety and options, won’t be embedded on a system level as Android Q’s gestures would be. Thus, you can expect them to be wonkier, hit-or-miss affair that may not be as smooth as the stock option. That has nearly always been the case with “acquired” navigation gestures, though, so we’d assume that Google is just trying to prevent inconsistent experience across the board.