Industrial designers have been the bane of my life as a project manager. None of them have any concept or concern if what they come up with is either manufacturable or legal, all they want is to see marketing men wet themselves and collect the big pay cheque.
It is then up to proper engineers to try to make their designs work - although I say designs, its just dressing, and departs from the technical brief at the first opportunity, no thought to actually what has to make the thing perform. Then if you do have to modify their 'solution' in any way you are accused of destroying their concept and they flounce off in a huff.
With regard to the helmet, you have to have a positive seal arond the mouth to actually draw air through the filters, and with no seperation or articulation from the helmet part the thing is utterly unwearable. Then in the event of a collision will very effectivly break your nose, jawbone and teeth - brilliant.