I think some of the folks on here might need to watch some other teams and pay attention to what they have in CF in order to get a baseline on Robles' actual skill level on defense.
MAT is not an appropriate baseline. MAT won a Gold Glove last year, which he deserved. A roughly average MLB CF is Brandon Nimmo. Robles is a much, much better outfielder than Brandon Nimmo.
Just go down the list of box scores from last night. How many of those guys would you rather play in CF just for defense than Robles? Honestly, like maybe 4 or 5?