I think that's demonstrably false given how good development tools actually are
No. Development tools seriously suck. Show me an IDE that can debug multi-client websocket code. Good luck. Every open source IDE's like Eclipse are useless these days because they can no longer keep up with the new problems being introduced.Light Table is maybe the first genuinely new, commercial, development environment to be introduced. People are gushing over the possibilities. All of a sudden people might, for the first time in 15 years, be willing to pay real money to make their lives easier.
The open source model is a socialist model that has failed to keep up with the pace of technological change, and encourages developers to not purchase development tools which slows innovation in development technologies. FOSS ultimately holds back innovation.