I wonder whether nore stringent pedestrian safety compliance requirements may have come into play. When I first saw that thing, that was the first thought that popped into my head.
In any case the website says the steps "Familiarization with all legal requirements that apply in Switzerland and the EU for approval" and "Consultations with the Road Traffic Office and test centers to define the testing requirements".
I'm guessing the familiarization and consultation steps would've revealed to them that "Yeah, nah, this isn't going to happen..."