"Why would it be this way?"
because jim lansing was building speakers long before there was any standard. we are talking 50-60+ years of heritage here. this isn't a chinese company that came along in the past 10 years and copied a design, but one of the founders of driver technology. there is pretty much an entire website dedicated to the guy's work: http://www.audioheritage.org/
though others have definitely advanced the ball. with that much history, it can be understood how they would be reluctant to diverge from his convention on the speakers most closest to his works.