I guess it falls in the free speech category. I don't like what you say but I support your right to do it.
HOA residents also have the right to make binging agreements, for better or worse.
Whether that preference is made through laws (mandatory mowing regulations), HOAs, community shaming, etc, is another question entirely.
Those who really don't care often end up moving to rural areas anyway, where the nearest neighbor is acres or miles away.
That's the thing I don't understand.
That said, in some areas, this could be attributed to economic factors (what materials are commonly available), traditions, or building codes.