Why is pickup not more poplar?

I love the sound of the EMG81. It's nice, thick and compressed. Great for High Gain sounds. I however have a single humbucker guitar and having just the 81 in the bridge does not cut it for cleans. Enter the TW. The split coil solves the problem. It maintains all the qualities of the 81, but cleans it up and adds the sparkle of a single coil to the sound. And it's noiseless!