I’m running HAOS and Docker in two different VMs on Proxmox, and it’s working fine for me so far.
So, I think I’ve mentioned this in another reply, but, I have a very minimal setup. It’s a RPi4 as the main device, Starlink as the ISP (CGNAT; no port-forwarding), and now Tailscale as the only way to access outside of my LAN. I agree that HAOS meets it’s primary job of running Home Assistant. Although, I don’t have the option to run Proxmox (at least I’ve never seen anyone run Proxmox on an RPi) and also have a massive music library (and soon a large movie and TV show collection, once I rip all of those DVDs) so I really only need to run a few things:
A dashboard to make accessing the services easier for the family.
A reverse proxy to handle subpaths (this used to be Cloudflare Tunnels with subdomains and NPM with subpaths, now it’s just Nginx).
Tailscale (to expose services and run a VPN to get past the CGNAT).
Jellyfin (for TV shows and movies).
A forked version of Goinc (I have a fork with LDAP support, there’s an open pull request for it, but it needs a little extra work; this wasn’t ran on HA).
Something to run LDAP authentication.
Some Home Automation software (was Home Assistant, I migth switch to something else).
Edit: I also run Vaultwarden.
I’ve really scaled things back since previous self-hosting journeys, and when I first started with HAOS there was even less going on, and really I need things to just work. I’m learning now that my mistake was assuming that HAOS add-ons are supposed to behave just like a Docker container, they’re not. I’ve learned the hard way, but, I still don’t love HA’s attitude towards something that are deemed “complex,” such as sub-paths and alternative authentication providers.