I never understood using a NAS OS and hosting non-NAS services there, it feels upside down. I would rather have a general purpose server OS with running NAS services. Same applies to Proxmox.
Agreed, I just don't see the point for a "homelab." Unlike many, I like very straightforward setups based on a regular distro like Debian. I also run many services bare metal. This includes nginx, email stack, DNS server, game servers, etc. I use use virtualization/containers for things that I treat as an appliance. This includes Home Assistance, Nextcloud, Matrix, Jellyfin, among others.
Proxmox is just Debian with a qemu and lxc webui. You can do anything with it