These projects are run by volunteers, they don’t have the unlimited budget for designers that Adobe does. And to be honest, it kinda seems like you’re just criticizing them for no good reason. Have you personally designed and built a website that doesn’t suck?

If you go with TrueNAS, you’re stuck with TrueNAS/Docker. If you go ProxMox, you can theoretically do…anything. But of course that comes with some added complexity.