[...] However TV advisories (here in our country, I'm not sure with others) said that it was okay which later on convinced me to believe the same thing. Hmm, why would they say that if it was a malpractice, because of the scarcity of surgical/N95 masks? [...]
Here (in germany), they claim it helps preventing the spread of the virus (infected people with mask protect the others). It is clearly communicated that they don't protect the wearer of such a mask.
But there is no study which really confirms the claim that it helps preventing the spread. Or rather, there are controversial studies with different results.
So i guess that's either a "this specific study said that.." kind of thing or some kind of reassurance of the population.