I was thinking the same at first, but when you think about, the defining feature of a digital nomad is that he moves from place to place and doesn't permanently settle somewhere, so I can see how this isn't quite as important as cost of living.

After all, if you don't like it in a place (or you're not happy with the public services) you can just up and leave.

Having said that, it'd still be nice and make the data inherently more useful to have additional data such as the quality of/access to healthcare (though I'm not sure how easy it is to quantify that) or crime rates.