There's a lot of nonsense at every level. Especially when dealing with heterogenous infrastructure.

Some NICs support http. Some NICs support tftp. Some NICs have enough memory for a big iPXE, other NICs don't. Some BMC systems make next-boot-to-lan easy, but not all.

We almost always use iPXE in order to normalize our pxe environment before OS kickstart. There's a lot to it and quite a lot of little things that can go wrong. Oh, and every bit of it becomes critical infra.

Ok, that makes more sense. I'm used to iPXE, and I guess that quick bootstrap from PXE->iPXE bypasses a lot of the nonstandard weirdness.