"Get rid of 3-point turns and reversing round corners, and you've lost the ability to turn your car around when necessary. Such as dead ends. Or car parks as mentioned."
Too late, they've already lost that ability.
To compensate, they make the idiots follow blind directions from their satnavs and follow the long way around. Until, as you say, you get to a dead end or car park.
At least the drivers who a are least able to drive will congregate at predictable known locations, like dead ends and car parks.