I don't know much about this, but I've seen a bunch of videos of apple harvesting machines doing their thing. Just search for "apple harvester" and you'll see a zillion videos
It's even possible that the boat adds basically no additional drag, and it's even remotely possible that it decreases drag. Mythbusters proved that a flatbed pickup truck actually gets worse mileage when driving with the rear door down instead of up, even though it seems like driving with it up would create a big wall that would constantly smash into the air.
Aerodynamics isn't nearly as intuitive as people assume.
There's a bunch of good uses for them (but none that outweigh the privacy problems). For example when you look at someone you met before it can pop up info about them like their name, business relationship to you, topic interests you've talked about before, etc.
I go in the opposite direction, I'm more likely to think lots of people have a touch of the tism