I buy that product and design are bottlenecks. I don't buy that engineering is not also a bottleneck.

Engineers like to claim everyone else is their problem, when in fact, it's often the case that engineers are their own problem.

Engineering is never the bottleneck… until it is. I have at this very moment months of completed design features that engineering should have already implemented if they were not in a constant churn of refactoring, reorganizing and spiking to fix self-inflicted defects.

Bottlenecks happen everywhere.