By set and forget I meant that a single or double boiler non HX machine with PID works well. My Alexia has a PID, and the machine is on a timer to kick on before I even wake up. I let the machine warm up for 45 minutes, then grab my shot. I don't need to flush or do a single thing and I get the same stable water temperature every single morning without having to think about it.
I'm all for testing and experimenting and playing, but I didn't want to add a flushing routine and other related variations related to an HX on top of messing with the basket size, amount of coffee, grind settings, distribution, tamp pressure, and all the rest of the stuff. Super automatics are not for me either.
You'd learn how to use an HX of course, most people do. But if you don't care much about milk I'd suggest a single boiler. Or, if you do want milk often then either an HX or dual boiler. Between those, if you don't mind some effort, to brew at a particular temperature, an HX should be good. If you'd like to program in a certain temperature and know that you'll actually get that temperature, then the dual boiler might be the way to go.