I'm betting it's because the big record producers all use the same methods and tools. If a song has a certain sound and becomes a hit and you can precisely reproduce that sound by buying a software package or using auto-tune or whatever, that's going to be very appealing to people who just want to manufacture hits. It's so easy to use the same specific elements over and over again and people have become less and less demanding so it's kind of natural for this type of music to become a sterile, repetitive thing.
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