I'm waiting to catch up with my DiL, then I'll update the thread regarding water ingress into a Toyota Yaris.
You have a point though, if something goes wrong with a modern car, there's not usually much that the ordinary punter can do about it other than 'take it in'.
They're far more reliable. That's why you don't see the AA man on his motorbike & sidecar saluting you at the side of the road ! In the old days any mechanic working on your car would be wearing a boiler suit and carrying a spanner & an 'ammer. Nowadays its a tie & a laptop !