Boutique shed dwellers the lot of 'em!
Yo, P23, Zinn or Roberts - they would most likely pass but, to comply and be insured, your product has to exceed CEN standards hence the 'over building'. You dont want a product to barely pass and subsequently fail, you want to be proud that your product exceeds by a long way any standard set.
Imagine CEN in the 1990's - no Kooka cranks!
Interestingly, current bikes are already near the CEN head angle 'limit' of 65 degrees.