The vast majority of the 'masks' I see can not ever be very effective because they are just diapers and have no chance of sealing to the wearers face at all whether they have facial hair or not. If the mask does not seal its main purpose is for show.
I think in this case it's, "Don't let perfect be the enemy of good."
Just because you can't achieve a perfect seal doesn't mean that masks have no merit. Even some reduction is expiration particles is a reduction.