I gave John Hirschtick a little friendly jabbing on Twitter over OnShape's lack of integrated CAM. He basically replied with "Just wait a bit..."
Integrated CAM is becoming a basic feature in any serious CAD system. OnShape isn't run by idiots, but it's a startup with a big hill to climb and only $120 Million in funding (sort of lean to boot up a real-deal CAD/CAM company). I do think they are moving in that direction though, because the market demands it.