Nginx is a lot less painful if you use Nginx Proxy Manager. You get a nice GUI and can easily get SSL certificates with Let’s Encrypt, including wildcard certs. I’m running it in front of a docker swarm and 3 other servers, and in most cases, it takes me about 30 seconds to add a new proxy host and set it up with https using my *.domain.com wildcard cert. I also use it with Authentik as a forward proxy auth for SSO (since many containers out there don’t have the best security).

To be fair, the add-ons are just containers installed and managed by HA. In most cases, you can install all of them as separate containers via something like Docker, but configuration takes more steps (though you also get more control).

Example: I have HA, Eclipse mosquitto, zigbee2mqtt, zwave-js-ui, node-red, Grafana, and influxdb all running as docker containers on two different devices (my main HA host wasn’t ideal for Zigbee and zwave USB dongles, so those are on a Pi 4). The other containers are accessible separately or from within HA as iFrame panels.

I think you may have misread OPs post. They haven’t built a PC since shirtly after they were 10-11, which was almost 30 years ago. So developments since the turn of the century are in fact relevant here, heh.

I don't actually own a Hue bridge and have never used one in my setup, but have about a dozen Hue bulbs (and additional non-Hue bulbs when "budget" options would suffice). I have HA running in Docker on my NAS and Z2M running in Docker on a Pi4 (which also is running my Z-Wave container) placed in a more central location in my house, which has a Sonoff Zigbee. They communicate with each other via gigabit Ethernet. Altogether I have about 50 Zigbee devices on my network.

It did take a bit to get everything set up and communicating with each other, and I specifically chose Zigbee channels that don't overlap with my WiFi (since they're both 2.4ghz). But my light response is essentially instantaneous via my HA app or a bound smart switch, so it's definitely doable without a bridge using existing tech.

I can second these. Have haf a very positive experience with some of their Blue 2-1 switches (and in a 3-way setup with Aux switch).