Man that Flagstaff job sounds rough, 40x60 is way too much concrete to watch crack up like that. Been there with a shop slab in Tucson where the north side looked like a road map after we thought we did everything right. Pre-wetting can help with the dry mix pulling water out, sure, but it also cools the ground down and that temp swing between wet subgrade and hot pour can bite you on the edges. Sounds like the mix might've been short on water or low on cement and the wet down just masked it till cure. Sorry you had to eat that one, it's the kind of thing that keeps you up at night.

Keeping it makes you money on the volume jobs, that's the whole point. Hand cutting is nice but if you're doing 20 drawers the jig pays for itself in time. Your eye didn't go anywhere, you just got rusty because you stopped using it, not because the tool stole it from you.