The cars I've driven in the UK have varied. The only ones I remember for certain are Nissan Micra (indicators on the right) and BMW 3 series (indicators on the left), and the others have varied. My fingers only seem to know which is which when the car is driving, and I still sometimes hit the wrong stalk if the car is stationary.

Compared to putting the steering wheel on the wrong side it seems like a minor point.

Not really - just mildly embarrassing, like spilling your coffee when opening a door. Where I come from imported cars vary left or right stalk. So it’s common to see people accidentally washing windows especially in rentals. No great harm and mostly amusement value since it’s very obvious to everyone, everybody’s done it, and nine times out of time they just try again the other way and get it right after that.

Probably not. You'd figure it out pretty quickly the first time you need to go around a corner or change lanes.

FWIW, ever car I've ever owned or driven in the US has left stalk for turn signals and right stalk for wipers. Headlights are often on the left stalk as well, but sometimes a physical on the dash (usually to the left of steering wheel).

Regardless, I have a strong dislike of touchscreen UIs in cars. Fine for the main radio, as long as I have physical controls on the steering wheel. But for open the globe box, or adjust the seat, or changing the wiper speed? GTFO, that's asinine.