Progression Builder

Seems pretty obvious to me but perhaps it isn’t, but I was curious why the progression builder tool only has songs which are in a major key?

It’s simply converting to the relative major. A minor will show up as C major in the progression builder, for example.

Still, it would be useful to be able to use the relative minor to find chords. It’s weird having ot use the major key chords to look for minor key chord progressions.