"Disclaimer for dev/student/test purposes only." Shouldn't be used with enterprise license, which may be against ToS.
The original intent is to avoid custom hardware configurations by using PVE as a layer. Hackintosh on bare metal can take days to figure out on new hardware.
It turns a days-long process into something that you can be up and running within like an hour. With OSX-KVM you have to set up the machine to be ready to do all the stuff like passthrough. This leverages the fact that Proxmox makes all that stuff super-simple.
I've got GPU passthrough working under Proxmox but not for Hackintosh. Will a Hackintosh work with most GPUs or only with certain brands/models?
Intel iGPUs work on bare metal up until about tenth gen Core series, but I don’t know if you can pass them through with Proxmox.
This list is a good place to start: https://dortania.github.io/GPU-Buyers-Guide/modern-gpus/amd-...
If you just want to mess around, RX 580s are pretty cheap on eBay these days and are fast enough to handle most tasks on a Mac.