Then I would have to build adapters and package them with the amp.... this is much easier in the short term. While I would love to lead the 4-pin revolution, I doubt that I have the volume or the industry clout to make that happen. Frankly, the 4-pin XLR is bulky anyway.... I'd love to see lemo connectors catch on, but they have their limitations as well.
I use them as separately sometimes.... especially with a vinyl source, or to compare two headphones off one source. I could see it being useful.