You guys probably don't completely agree with that everything from my '14 Ram 1500 to my girlfriend's '19 911 Turbo S and everything in between have been washed exactly once, each. That was a couple of months ago.
And that was only because a local wanna-be car detailer had a special. He spent two days washing cars here.
The nice ones have never been driven in rain so the important bits are still clean, but they don't really seem to be running any better than they did before the wash.
Yes, we very much enjoy these cars, but think it's much more enjoyable to drive them (and fast) than to try to keep them clean. I can't stand rust, or dirty undercarriages, but dirt and bug splatters doesn't really bother me that much.