I mean, neither of these are things I agree with, so I'm not sure the point of having the debate. Maatta-Schultz has had success in the past, and I'm confident Maatta will get back to his form from last year when not paired with a bad partner. Pettersson-Johnson has been an effective pair both offensively and defensively, it's nowhere even close to Dumoulin-Hainsey statistically.
It's going to be hard to find any middle ground on a discussion when the start is so polar opposite, so I'm not sure if there's a point in debating it.
Are you looking at the pairs without Schultz, then? I was looking at this team fully healthy. Of course if you take away the team's #3 defenseman and 2nd best puck mover, it's going to look way worse.
To me, the defense on this team reminds me of the 2015 Hawks. If you can ride Schultz, Dumoulin and Letang like the Hawks rode Seabrook, Hjalmarsson and Keith, I think you're completely fine. I don't see any reason to think the Penguins can't do that, hence why I don't like the original comparison.