That's standard operating procedure for every manufacturer these days. I know a guy that's driving around his brand new F-150 with the nastiest case of piston slap I've ever heard and only because Ford instructed the dealer to tell them it's "normal". Same with another guy's brand new 2018 Tacoma that has one of the loudest howling rear diffs I've ever heard. It gets louder and louder and Toyota tells him it's "normal". Same with his 6-speed automatic transmission which slams into gear, nearly stalls when taking off at a stop light, and shudders around town. He said he bought a Toyota for the quality. I haven't seen it and Toyota clearly doesn't back it. It's a bad trend in the auto industry.
That being said. Half a dozen oil cooler lines with bad crimps is T-I-N-Y amount when hundreds of thousands of these trucks are on the road. These external oil lines fail on EVERY brand of vehicle. As I pointed out before, Toyotas were infamous for oil line failures. Literally hundreds of thousands of vehicles were affected and hundreds of cars destroyed because of it. At this point, the oil lines on the 2019 GM trucks is something to be aware of, but not to worry yourself about. If you see oil residue building up on the outside of the lines, take it to the dealer and have them replaced. They generally don't blow off out of the blue, but instead oil seeps out from the crimped area in the time leading up to a failure.