The only time our Z isn't under cover overnight is when we're on holiday. Otherwise, it's in a car port under my wife's first-floor office.
It's broken down only twice in 80k miles. Once, a failed injector. The second, after being left outside for 2 nights at the end of January in Noah-esque rain (because SWMBO thought the car port ceiling already looked wet and might collapse on the car). Certainly, the rain was heavier & longer than I can remember seeing in the UK.
The car was then driven hard and left for a while.
So, I reckon you might well be right.