Lots of stuff gets built without folks doing the research and something minor gums up the works.
Years ago I wanted to fit a 100L lpg tank in my RX7 , basically where the back seat is. But because it was complianced as a 4 seater there was no way the man would license it. so it got a 60L tank mounted behind the back seat.
Just an example of how small things can derail a project permanently.