I think we rarely see them nowadays for these reasons. Nyloc nuts tend to be the norm for things you rarely want to come undone again. On bicycles the quick-release skewers have replaced them. I can't actually remember buying anything in the last twenty years that utilises them.
Bicycles are unfortunately losing their quick releases because of the disk brake incursion and the increased risk of wheel ejection when not properly installed. Plus carbon frame builders want to skimp on robust dropouts to make up for the weight gain of the heavy hub and brake setup.
Wingnuts are strong, and you can pry them on, and off with a screw driver.
I made a portable shack with carriage bolts and wing nuts. When it came time to break down the wood has all swelled with moisture... so the screwdriver loosed them all.
Nylocs can only be reassembled a few times before they stop locking, and many people use loctite to address the backing-out problem.
So they definitely still have uses!