> For booting the computers, I either boot them from Ethernet or I boot them from a small USB memory that uses a FAT file system for storing the OS kernel, either in the format required by UEFI booting, or, when booting Linux in legacy BIOS mode, together with syslinux, which loads the kernel.

That certainly works, but I'm pretty sure that moving booting off of your main disk is the only reason you can go without partitions, and I'm also pretty sure that most people don't want to deal with that.