Bear with me for a moment; there's a libertarian principle here somewhere. Firstly, I'll admit to either snobbishness or good taste (depending on your point of view) in relation to how homes look. I scorn laminate floors, despite having one in my kitchen, wince at 'Tudor' plastic windows in honest Victorian frontages, despair at concrete blocks paving over front gardens and yes, loathe satellite dishes. Most of the time it's none of my business how other people's houses look, except perhaps if my neighbour covers his elegant Edwardian facade with stone cladding and Tudorbethan 'leaded' plastic windows augmented with a 6' satellite dish; this would make my own home less saleable and lower its value and would be of legitimate concern.
Because some buildings and groups of buildings are exceptional, their very presence adding to the general quality of life, they are protected from inappropriate alteration or destruction by law. If a home is listed, you can't do the things that are normally, in planning terms, Permitted Development. You can't change the external appearance without consent, or mount a satellite dish without permission. Sensible democratic constraint for the greater good, or insufferable restriction of liberty?