But it doesn't, I read about infestations and mildew regularly from people that are methodically clean, I've had thrips once that come with cuttings anyone can be caught with that sterility didn't play a part in it.
I wouldn’t recommend anyone not to but i feel it's a waste of time if you keep the room clean, as in wipe up spills, put waste in the bin etc there shouldn't be anything to harbour anything lol