Cosmetics are a major reason for house changes. But there are those changes that have little or no cosmetic value, and make one wonder...what were they thinking?
The house I grew up in (the one with the 70s tile) had a lot of these little mysteries. For example, the house had had oil heat for 15-20 years. Oil furnaces require an oil tank. Yet, there were at least four--count them, four!--such tanks.
Such mysteries probably have a logical answer, if you knew the circumstances. I know my parents made some changes to our house that could seem puzzling. Assuming the current owner hasn't changed things, one might wander into one room and wonder...why the heck is that ceiling light so close to the wall, instead of the center? Answer: that wall wasn't there when we moved in, and the light was more or less center for the big room that had been there. We added the wall, but the light was never moved. I don't think my father ever did anything electrical beyond replacing a worn out switch. Certainly, he had a tendency of putting things on a "someday" list that might as well have been a "never" list. Yet, a person of today wouldn't know any of this...all he or she would know is what he or she can see.