Yes, I would assume too that to add playlists shouldn’t be that much effort. At least to implement. But they would also need to be updated regularly and maybe that is what envato can’t effort right now. I think it could be true that as @MojoSoundtrack sais, that they probably need more staff.
Maybe they are also working on a totally new system, which will be able to feature all kind of cool functions and they simply don’t want to “waste” more time on the old system. But I agree that playlists shouldn’t take that much more time… In general more transparency would be very helpful. To give some reasons why they do or don’t do certain things or just let us know that they are working on it. I’m not a regular forum visitor, especially not on the audiojunge corner. Does envato ever give development updates here?
Yes, that was the idea to listen directly to the main theme/mood of the track and don’t need to skip through it and maybe still miss it. But I haven’t thought about it from the authors perspective. You are totally right, authors probably start “bigger” than the song would regularly need. A lot of Authors probably do fear that customers don’t keep listen up to the main topic of a song. So they start with it, even though it would be better for the song to slowly build. So this feature probably would also mean higher quality of the songs because authors have less fear customers miss the main parts and concentrate on what is best for the song.