I grew up in a family of six with one bathroom and just a bathtub. We didn't have a shower until we moved to another state and my dad built us a house as his retirement project. That house had a shower upstairs and a bathtub in the basement! I still like to soak in the bathtub now and then, with Epsom salts and some essential oils.
As my father never tired of telling me, he lived in a tenement, 9 families in one house and one toilet on the ground floor. We all expect multiple bathrooms and en suites these days.