They're already an excellent pair of defensive spells in the first place, so they'll protect your board no matter how you cast them
is unnecessarily pushed, to the point where it made waves as a top card in Vintage Cubes
What might normally be a D easily becomes a C or higher based on the flexibility of the card
Thats an eternity in Commander, so I wouldnt expect Concierge to come back more than once per game, but that also means the other creatures youre suspending in limbo also become non-factors most of the time
If I had to choose one of the mentioned cards, I might choose Illusionist's Gambit because it feels like a better fit in a blue-colored control deck, rather than Boros which is usually aggressive
For board control, upgrade into bigger resets like Blasphemous Act and Farewell