Edits are produced for the scene and whatever is happening in that scene, We have had a wave of disco edits and balearic edits and just starting to see deep house and house tracks edited. Yes it is about taking what the artist thinks are the best elements of the song and also as simple as making a song more Dj friendly, adding or extending a drum loop for mixing, there are trends that come with edits which come and go, it was all about holding out with a vocal when I dj'd and letting the meaty part hit near the end of the track, lots of looping and stabs adding fx. Jiscomusic/D - Classics/Sound Stream, I dont know what is happening with editing nowadays but do see the same songs been edited over again from 5/7 years ago. and they have been edited many times before. Edits were born to make the song individual to the Dj that make it and never intended as they are maybe seen today, It went edit madness when I was Djing, and tbf most where shit but they gave Djs and their nights a platform/identity in their scene. You could listen to some edits and slowing down the pitch warranted it as an edit, ridiculous. I have been guilty of it myself, Switching Elton John - Out of the blue pitching it down in speed and calling it Slo mo edit. thats how easy it could be. its how far you want to take and change the song.