Technology

Except they could totally fit a radio compatible with rear view cameras in a standard double din area, with a decent enough sized touch screen.

My double din aftermarket stereo I installed in my '07 Fiesta XR4 (ST150 for those not in Australia) is fully capable of all the inputs a modern connected stereo has, and more. It has an almost 7 inch touchscreen, has tactile media controls on the front and inputs for front, rear and a third camera, along with RCA's for Amplifiers and subwoofers. It also supports Bluetooth, Wifi and 4G via user provided SIM(although I don't use the 4G - I just hotspot it to my phone via WiFi) it also has Apple carplay and Android Auto supported.

Best part is it runs full fat android 10 and supports OBDII readers, meaning it's a built in scantool for my car.

My preferred setup in any car is tactile aircon controls, steering wheel controls, and tactile media buttons on the head unit. I don't like touch screens because you usually have to take your eyes off the road to use them. which is dangerous. Tactile controls are better because you can usually tell what they are just by feel and therefore don't have to look away from the road to use them.

So if it has one, I prefer it not be Tesla sized. I'd say 10 inches is my maximum, and small enough to fit in a double din is my ideal size. Especially given no two stock head units are the same, and some better than others - I'd like the opportunity to upgrade it if necessary without having to rip half my damned dashboard apart.

My current car you could slide out stereo using with 4 euro type head unit removal keys (you can however use some steak knives in a pinch if you don't want to spend the $2-10 for the keys) no dash disassembly needed.