The author can't fork Rails because "the amount of work that goes into maintaining this ecosystem is enormous and expensive."

Rails IS FREE TO USE. If you want to improve test driven development, do the work yourself. Or start a company and dedicate 40% of your extremely well paid engineers time open source code others can use for free.

37signals and Shopify make the decisions because THEY DO THE WORK. I am happy to sit back and free load off of their contributions even if I disagree with DHH and Tobi's political opinions.