I have never seen loose screws "checked" in tech. And I have done a ton of track days with more than a dozen different people. Racing orgs check that the oil plug and filter are safety wired, so the oil pan could actually be off at tech. There is a lot of crap that gets passed at track days anymore that I won't do. I wire everything, and run Water Wetter instead of coolant.
Z2 may be more thorough than others, I suppose. I was notified about a loose screw on the passenger peg of my WR250 at tech last year.
This year, as part of my training to work the grid, I was told to look over the riders and bikes for things like: unstrapped helmets, unzipped leathers, loose GoPros, loose screws (as in visually backed out), un-taped wheel weights, etc.... anything that can be a danger to the rider or other riders.
I did a TD with another provider at Buttonwillow earlier in the year and tech was them looking at the bike for 5 seconds and making sure I had a sticker on it before I rode off.