¿Por qué los dominios con guiones son percibidos de peor calidad?
Speed and Minimal Effort
It is simply a matter of speed and minimal effort.
If we have to type a name on our computer, it may not be so important to add or not an hyphen, but if we are on our mobile then things change.

Simply having to switch keyboards to write an hyphen can discourage people from writing your website. Yes, it seems incredible, but think of yourself, surely unconsciously you tend to avoid it.
We are designed to do things with minimal effort, it is not evil, it is evolution.
As I can check from the NameUpp usage reports, less than 1% of the generated names are hyphenated.
Mobile traffic grows more every year and in 2017 it exceeded desktop traffic, as you can see bellow.

So, when you’re picking your domain name, try it out on your mobile phone first. Is it easy to type?
Now, when you get your domain, you decide!