This way you could have one regular boot UKI profile, plus one that implements a recovery mode, another one that implements factory reset, and a fourth one that maybe boots into storage target mode.

systemd-boot has been updated to synthesize multiple menu items from a single UKI – one for each profile defined in the UKI.

While I'd expect that the primary use for multi-profile UKIs is to have a single set of kernel + initrd, plus a separate command line for each profile, …