Because it's weird in ways that provide no real benefit except towards the gratification of the designer for having done something novel, and uses those novelti

Because it's weird in ways that provide no real benefit except towards the gratification of the designer for having done something novel, and uses those novelties as an excuse to willfully leave out the data that's normally used for that. You do need to understand it to implement it correctly (or rather, as correctly as its design will allow you to), but there's a naive implementation right within grasp — so the people implementing it in a larger playback system will do that because they already have full support for everything else and aren't about to refactor everything for your fanciful shit. They just want to tick a checkbox on a feature list that their real users don't really care about.