Everyone I've talked to about this has consistently agreed that the convoluted multi-step interface required for scrolling and zooming is far more distracting than a simple pinch-to-zoom... so that intention would be misguided, to say the least.

It also seems like every in-car map interface except CarPlay supports pinch-to-zoom these days, including the OEM maps from manufacturers like VW and Tesla, Android Automotive, and Android Auto. VW won't even let you see your backup camera while you're driving because they think it might be too distracting to have another way to see what's happening behind you, but they think pinch-to-zoom is just fine.

I don't know the details, but I am sure it's not possible for any car to open the backup camera while driving (at least for every single car I've driven in my life) I remember someone tried to flash the car settings & set the km/h "limit" on when the backup camera closes higher than default, but the system just encountered an error. Can't really say for sure why that's the case, maybe because it's mandated (in the EU?).