I live on a hobby farm.. pigs, chickens, dogs, cats.., and a young child... we get plenty of exposure to bacteria. We aren't "clean freaks" by any measuring stick..
Exposure, like you say, is a good thing... until you're exposed to something your immune system can't fight.. Athletes foot, Legionella, Noro Virus,, and a host of other nasties.
Have you ever had Norovirus? Let me tell you, I've had it.. I think I'd rather have covid, then the flu, then covid again, then have any two finger cut off before I ever agreed to have Norovirus.
Being exposed to a simple dog in the house is enough exposure to keep your immune system strong.. Studies are clear on this.. Kids with dogs have lower rates of allergies, infections, and a bunch of other stuff.
They actually discovered that dairy farmers have a lower cancer risk than most other people. Something about the poopy particles they're constantly inhaling causing their immune systems to become hyper-strong.
The purpose of this study is to evaluate cancer risk associated with raising animals as commodities, which is associated with a variety of exposures, such as infectious agents and endotoxins.Information was available for 49,884 male farmers in the Agricultural ...
www.ncbi.nlm.nih.gov
And it doesn't stop there.. Children on farms are healthier too.
Animal germs = good
People germs = bad.
Sleeping in my chicken coop, with the chickens, would be less risk than going to the gym or a hotel... My chicken coop is a little bigger than a California King sized bed if anyone is interested.. (LOL)