Not limited to Android. On iOS for example Safari loading some ads or whatever causes so much input lag that the keyboard can't keep up and mangles the input completely. And on some websites that one just shouldn't visit without rigorous blockers (ehrm reddit) the device becomes so sluggish to respond that taps on the close button are not registered consistently any more.

Yeah just try using your phone while Google's updating some crap in the background again... Doesn't depend on the newness of the phone either — this happened on every Android phone I've owned since 2011.

What, you don't enjoy the back-button+muscle-memory keyboard/navigation tango?