Most likely not. However, proxmox is a bit strict here and there on how it wants drives, networking and other stuff laid out. Also the hypervisor itself is quite strictly only for that. So, if you want to tinker with something without virtualization platform or use your drives for something else than just proxmox-installation it’s likely not officially supported at least and might cause some headache or even bigger problems, like potentially losing data, if you run it in a way it’s not meant to.

However, if you just want a pretty capable hypervisor and run all your stuff on top of that it’s perfectly fine, specially for hobbyists. For bigger enterprises it has some issues and management for a bigger server fleet, at least for now, isn’t as polished as the ‘big players’ have, but, again, for home gamer it’s pretty good solution.