"Powering on thin provisioned virtual machines may cause multiple hosts [running ESXi 7.0U3] in an HA cluster to fail with a purple diagnostic screen."
Maybe I'll hold off on upgrading just a bit longer...
@XSGeek Good thinking!
Of course now I'm going to be paranoid about my home lab which is running 7.0U3 and loaded with thin-provisioned VMs... including my WireGuard VPN host so that I can test stuff while I'm at work.