this might be a bit hard to explain without an example...

say you want to create a Christmas playlist, but you don't want to just hear 15 different versions of Joy to the World. you could tick a box that limits the number of recordings of the same work (perhaps including arrangements?), and it would spit out a varied Christmas playlist~

this could also be good for other genres where re-recordings are common, like perhaps Jazz or Praise & Worship music for instance