Well, those parameters are intended for GA to parse, so there's several reasons for analytics competitors to not add those:
1) they make it easier for the marketer to setup campaigns with a paid competitor, and then drop the subscription for that software and monitor them with GA only
2) they make GA top-of-mind for marketers every time they look at a link with UTM in it, even in somebody else's marketing dashboard (free advertising for GA)
3) GA gets to collect campaign data, freeriding on the analytics competitor