I do have a couple with an age old Java IPMI… Agreed, a real PITA…
But most Proxmox run on HP Hardware (At my clients) and almost all have way newer HP ILO. That’s their “branded” IPMI - “integrated Lights Out” , implying that the lights in an empty server room do not need to go on…
My OPNsense also does not have an IPMI, but due to where Internet comes in in my home, it’s right next to the telly in the living room, never a long distance away…