Well forgive me but I was hoping for more than a first hit from Google and apparent common knowledge.

Since you mentioned having read studies about airborne transmission and aerosols, I was hoping you could point me to one where they examined the masks and found them to be significantly worse than FFP2.

Because in this study presented, only the people in the direct path facing the infected person were infected, not everyone, so wearing even EN14683 IIR masks could seem effective.

My guess, and this of many doctors in my area, is that EN14683IIR are, in fact, enough (if properly worn etc). If that is not true, I‘d like to know - from a reputable source.