UEFI does or could do a number of things that a system admin might wish to have or select.

A main weak point in security is the local access.

To continue this [sorry] I think that "dual boot" generally refers to the same bootloader booting more than one OS or version of OS. There isn't really any point to describing a "dual boot" where a hard drive booting one OS is simply replaced with another OS -- it's a cool thing to do but doesn't really help people "dual boot" in the real world.
I could, if I wanted, buy 100 USB sticks and put a bootable OS on all of them, then boot from each of them on this laptop -- that doesn't make it "cento-boot" in any meaningful way.
I'd call the UEFI-type boots dual-boot, perhaps, because they take some time to create partitions and the like above and beyond the simple BIOS but I don;t really consider them "dual boot" for the sake of trying to give advice which, I think, is the point of this kind of thing?