Other than the lighted buttons, I don't think it has a toy-like aesthetic at all. It's a very classy black metal finish. But I actually love the colored buttons. They improve my mood just looking at them, plus when I'm using it in a darkened room they make it incredibly easy to operate the device.
I'm reminded of the movie "Mars Attacks", where the Martians had these cool toy-like weapons that totally outperformed the complicated, industrial-looking American weapons
More is not always better. If you don't actually need all those features and just want a DAC that does its job without unnecessary complexities or having to read and navigate tiny menu displays, then the Mojo 2 is a very nice alternative to the DACs that try to cram everything but the kitchen sink into one device.