I haven't used Docker much at all, but I use Proxmox for everything at home (LXC containers for various web servers, Zoneminder, Plex, Pihole, etc. and the occasional VM for stuff like pfSense) on decent hardware. Which HA installation method would you recommend in this case?
My only prior HA experience was around 2017 before they had multiple options; I used a RPi which burned through microSD cards and it was pretty miserable. Gave up by 2019. Not making that mistake again.
I've been using HA since near the very beginning, and I recommend using the Proxmox Helper Scripts script that installs the HAOS VM. That's what I do. I disagree with the OP, HAOS simplifies a lot of stuff like addon installations, updates, backups, and migrations. It's the main supported way to run Home Assistant now and the one they spend the most time testing. HA is probably the most critical piece of software I run, so I want it to work, and I don't care about also running other stuff on the same system (other than addon's) because I can do that in a separate VM. Having spent years running it bare metal and in docker that certainly works fine, but HAOS made it a lot less effort to manage and has been very reliable when I ran it on a standalone machine and then when I moved it under Proxmox.
My only prior HA experience was around 2017 before they had multiple options; I used a RPi which burned through microSD cards and it was pretty miserable. Gave up by 2019. Not making that mistake again.