In some disciplines, notably cross and mountain biking, there is rarely, if ever, a need to shift the FD. So why bother with it? The 1x set up is simpler.

Specialized also offered a 1x Venge last year and a 1x Allez this year. They are designed for racing crits, where almost no one ever finds a need to shift out of the big ring. If I had the money, and room in my garage, for one, I'd probably buy it.