You forgot to mention perhaps the most important, most detrimental thing about wearing a mask for a full work day- it forces you to TOUCH YORU OWN FACE every time you want to take a fucking sip of water.
What gets you sicker more than anything else? Touching your face with hands contaminated with an infectious agent; rubbing your eye, scratching your nose/cheek, wiping your mouth, etc.. These are the things that will get the flu or w/e you touched on the doorknob to actually enter your body.
And wearing a mask all day forces you to frequently either touch your face, or come very close to touching your face. Either that, or become dehydrated from not drinking enough water in a day. Either way, medical institution wins- you develop a condition you may need their help with.
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