Earlier quoted context omitted.
Do you have an example where that's not the case? Jumping around on Google maps to random cities the world over shows buildings that look "kinda like" the ones they're near. Every once in awhile you find a immaculate mansion in the middle of a favela but it's rare.
While I'm sure there's exceptions I'm not aware of, I'm not arguing that it's the case, I'm saying I don't understand the desire for this. That said, in some areas, this could be attributed to economic factors (what materials are commonly available), traditions, or building codes.
"Please take this with an open mind. To the extent I care, it is a mater of aesthetics. I enjoy seeing a less cluttered and more maintained environment. Because they are my neighbor, I see their front yard frequently, as do my visitors.
This is basically the same reason that I don't like it when people litter and leave their garbage in the street, or I don't leave dirty dishes around my house.“
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Nobody cares if the house next to them looks different but beautiful. What they don't like is houses that appear unkempt or ugly.
In some places this is maintained by City and County ordinances, like that you can't use your yard as a garbage dump. In other places there are more nuanced social expectations and judgments.
There's obviously a wide range to the social expectations. In some places, people won't complain if you fill your yard with cans and bottles. In other places, people might complain if your paint is ugly and your plants are not maintained.