Good analogy: Marlin or Sprinter/RepRap etc. do what you tell it to and when you tell it to. The Duet Maestro on the ProMega tell you what's on it's mind and you can still tell it to do stuff, but it's more of a control panel than Sprinter or Marlin are. It's heavily equatable to OctoPrint.
I mean, you can control through pronterface sure, but if you already got the IP address shown I would use that. The
promega/thing, I've seen that work for about 2% of people on Discord, it's really not common. I can't get it to work myself but IP address works every time.