Ed Fries was one of the creators of the original Xbox, but he's since moved on from Microsoft. In an interview snippet from Geekwire, Fries is asked about what he thinks of the Switch. You can see Fries' response below.
When I first saw it, I thought it was creative, but I wasn’t sure if it was going to be successful. Some of the ideas we had actually talked about at Xbox, like having controllers you could separate and hold in each hand. I first played Zelda on the Wii U and enjoyed the game, and thought, maybe I don’t need a Switch. Eventually I buckled and got a Switch to play Mario, and I was really surprised how many different and creative ways they use the controllers, how they can be joined onto different supports, or you can separate them and hand them to another player and turn them sideways. It’s something that’s really won me over as a cool machine.
I love how creative Nintendo is. Now they have this Nintendo Labo with the cardboard. When I saw that I thought, good for you Nintendo, I just love how they’re always thinking outside the box. This cardboard thing ties into the whole maker movement, and it’s great to have kids building something physical.
I don’t think the right thing for Microsoft or Sony to do is imitate Nintendo or try to be Nintendo. I don’t think they’ll succeed by being Nintendo. I think they’ve gotta figure out what it is that they do well and continue to do that well.