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Somewhat related to this, but every single Raspberry Pi supports PXE booting if you drop an SD card in with the latest boot code (and nothing else). The documentation for the whole process is pretty poor all around, unfortunately.
Removing the need to have the SD card pre-marked would make it much more like PXE to me. Having to interact with the SD card goes to "I might as well burn the OS I want onto the card"

I used to use PXE/Bootp mainly to rescue racked hosts, where I couldn't get into the room and Dell console media wasn't working for me.

IIRC the RPi4 can do PXE with no SD card (it'll try to TFTP boot files). The hardcoded bootloader in 1-3 either don't have PXE or have broken PXE code (I cannot recall exactly what the case is).