A couple of reasons. First, it looks better to most; a flat wall would look sterile. Second, it hides imperfections. Dings, screw heads, and scratches show up very well on a flat surface, and you can’t easily tell on a textured one. Third, it breaks up echos. Like, big marble rooms are amazing to visit and hear how everything echos, but it would be overwhelming to have it in a living space.
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