It makes a good deal of sense. Folk song collectors in the early part of the 20th century often noticed that singers appeared to be using intervals that pre-dated equal temperament, and non-classically trained fiddle players (having no frets) often still do that, though we have to make adjustments when playing with fixed-pitch instruments. To my ear, that means that I often have to play a bit sharp or flat on certain notes so that they fit with, in particular, the free-reeds.

You can get electronic tuners that will do just as well as equal temperament nowadays; unfortunately I don't remember who makes them. A friend (classically-trained fiddler escaped from the straitjacket) has one, and I'll try to remember to ask.