I really don't get this.
The EU helmet specification is for a impact at 12mph, which is roughly the speed your head would be moving if you fell over. So helmets are mostly about cosmetic damage, not saving your brain. So to me it makes sense to wear a full face helmet, to actually protect the parts of you that would matter if they were cosmetically damaged.
Fascinating that the Bontrager helmet description is entirely about appearance and comfort, with no indication of the protection it would offer in a collision; not even a mention of what standards it is constructed to.
(Edited to change "collision" to "impact")