Why is it considered normal to bathe/shower daily?

Because Americans are paranoid/ashamed about being physical human beings? Plus we're the product of 100+ years of massive advertising campaigns aimed at making us feel insecure enough to buy grooming products to make ourselves acceptable.

I am with u thats why i shower twice a week i mean month ok once in 2 months

To wash off the 30lbs of dead skin cells that otherwise flake off each yr everywhere we go. So we're only leaving 10lbs worth a yr that work their way through the weave in the bed sheets for the dust mites to eat off our mattress. So the perspiration that goes bacterial within 2 hours and multiplies at exponential rates every 6 hours doesn't make us stench like a passed out drunk that lives in a trash heap. So we don't get head lice to pingpong from school kids to their parents back to more kids. So our hair that falls out or breaks each day isn't scattered in every office store and workplace, ..and that dull grease matted mess doesn't fall out on the crown of our heads when we're 28.

Little things like that.

We know we’re not supposed to but showering is easier.

I’m living in a water restriction zone level 4 atm.. The dams are dry. When I have a shower I collect the water in buckets... for the plants that won’t survive and to add boiling kettle water to.
A nice soapy sponge bath ... yup ...everyday...maybe twice .... just saying...you don’t need to shower everyday

There is such a thing as over cleanliness. The human body has a remarkable immune system and this trend of bathing and sanitizing that has become so common place is actually harming that system and the reason illnesses are making such a comeback and becoming so widespread. This paranoia over personal hygiene and this germaphobia is not really all that good for us. I'm not saying there is anything wrong with being and living clean, I'm just saying that in recent decades we have gotten anal about it unnecessarily...we actually need dirt and germs.

Didn't realize ppl don't get dirty. I practically have to scrub my skin off to get clean.

Because you're not accumulating dust.

If you are keeping your skin hydrated and caring for yourself who cares? I mean is this a public health crisis? Why do we need to worry about people showering daily?