The only thing a mask does is keep your exhalations from being dispersed over a wide area. As far as intake...... Yeah, not so much. For intakes with all these masks, it ain’t a HEPA filter. And all the folks wearing the home made masks and bandanas? How often do they get cleaned/sanitized? As far as outside, pretty sure our friend Mr. Sun tosses out some UV rays that will take care of the nasties floating around.
I hang mine out in the sun for the day after I use it.... a few times.
My favorite personally-known medical resource person (who is not my doctor, BTW) has set up what is for her family a sufficient compromise. When necessary to interact with strangers (e.g. in a store) they wear Cambridge Mask which is pretty much an everything-filter, except that they ordered the masks back in March and now the masks are so backordered that by the time you could get one the situation will probably be over. Otherwise, outside, at church, and at home, no mask.