I know the consensus is that hard shells are not good for the hinges but I bought one anyways for a 2018 NTB 13" MacBook Pro. Not exactly sure why as I bought AC+ and a skin from dbrand. I always get this knee-jerk reaction to cover all my new stuff and then end up taking the cases off after 4-5 months. I worked in Apple Retail for 4 years then as a MacOS T2 Team Manager. Honestly we saw many machines come into the store with hard shells and the Geniuses generally didn't frown on them. They had to remove them before leaving them, but no one got a lecture about wear to the hinge.