The main purpose you want to abuse the beginner decks is because they are useful at giving your rewards, primarily the daily quests that need you to complete certain tasks
Plus, you get to exile artifacts, creatures, enchantments, and graveyards (or any combination thereof) rather than just destroying permanents and sending them to the graveyard with Austere Command
Its a bit cheaper at $3, but its still a great addition to the sheet
But fetches already have enough cEDH viable hate from Mindcensor, Blood Moon, Shadow of Doubt, Ashiok and more that I'm not worried about fetches
With the sets pre-release period in the rear window, players everywhere are finally getting a proper look at it