I've noticed that when I hit 400% zoom on a responsive site page it automatically converts to a mobile like view.
Given that isNativeMobile still returns false, so is there any way to automatically hide grid columns and interface components to provide a more appropriate view if users do this?
E: Also tags cause this to crash everytime I click on the box.
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Unfortunately there is no way to determine OOTB when the 'browser' thinks you are on a mobile or not.
If 400% zoom is something that your customer may do as part of the standard, you may want to just plan for that in the design. Or put a message on the screen that tells them if they are on a computer or tablet and see 'X', try changing the zoom.