I agree using adb shell wm overscan 0,0,0,-170, instead of -143 gives more immersion and COMPLETELY hides the navigation bar..... use with oneplus gestures and its AMAZING!Hello!!.. I use this also to hide my navbar but with -170
Haven't seen the navbar since then
The only thing that you will miss are the bottom accesses on the lockscreen (camera, assistant), although they are still accessible by swiping from corners...
For gestures I use "Edge gestures".