I take chlorophyll supplements so my body never smells, and I trim my own hair to an eighth of an inch. However, beard stubble interferes with my comfort in trying to sleep, and I do not like wetting my face only for shaving at the sink, so I'll shower every few days when I am housebound, shaving in the shower, washing with original Irish Spring bar soap and using a crystal deodorant stick (which lasts me about two years, LOL). I shave my beard closely against the grain so I can go a few days before I need to shave again.
For me, it's about physical comfort inside my own skin these days.
Before driving out for any reason, shopping or appointments, I always take a shower & shave, trimming my hair first.
When I had long hair, long before I ever started using chlorophyll supplements, I had to shower every day, but I was also physically exerting myself then, and my skin was oily when I was younger. Now, with degenerative disk disease and bone spurs in my neck and back, I can't exert myself enough to work up a sweat.
Given an active social life, daily job or volunteer situation, I'd still be showering every day.