Have you thought about how paper maps can be wrong? GPS gets new info all the time so you don't take a bad turn. I see @shanefisher likes the puzzle, but that good feeling won't help if you're lost. Maps are just more stuff to carry and they can get ruined easy. Choosing the hard way because it seems cool is how people get into trouble.

One angle I never see talked about is the waste. No-bake sand doesn't have the bentonite clay, so you skip that sticky sludge cleanup. It breaks down cleaner, which saves a lot of time after the cast. For smaller operations, that back-end hassle really makes a difference.