I'm biased (I coach PMs for a living) but Andrew Chen is right. And honestly I think he's underselling it. His whole argument is one line. When anyone can build, the person who decides WHAT to build becomes the bottleneck. After coaching hundreds of PMs through this shift, here's who actually becomes that bottleneck. ✦ PMs who build the prototype first and write the spec after will be in crazy demand. ✦ PMs who can look at 15 working prototypes and pick the 3 worth shipping will be in crazy…