MTB decks (Trampa, Kaly, MBS, LaCroix) use channel trucks, which have a straight Kingpin. These type of trucks have to mounted at an angle as a result, which is why you see the end angles on decks. It’s not so much an advantage as it is a different design approach.
Longboard decks & trucks are a different ballgame and aren’t compatible without large custom angled adapters/baseplates.