Because it's all subjective. I'm sure that as many people that love the Mola Mola & Benchmark there are equal amount of people (or more) that don't care for it. Doesn't make either person right or wrong.
You could almost drop it into 2 different classes of people. It would be oversimplifying it but we have those that like the utmost transparency and others that prefer the sound of a little distortion. Not noise generated by power supplies or internals but distortion in the form of harmonics..which a little bit of certain order harmonics don't sound like distortion in the way many might think. Still distortion though.
I do feel that this is where measurements can be useful. Actually I'm of the belief that all data and measurements are useful.. it also keeps manufacturers honest or helps us know which one's make BS claims. Trust your ears as they say, but also don't discredit measurements and data..they can tell you a lot about a product. You don't have to be of the mindset that perfect measurements mean perfect sound. Well to some people it does but it's all subjective at that point, so whatever.
Personally I like a dac with upwards of 20bits of dynamic range or "state-of-the-art measured performance". Clean and transparent. I can add some flavor or distortion somewhere else down the signal line.