Personally, I am of the opinion that a strong emphasis on test-driven development in the long run will cause waterfall-style development. Tests are all about risk-prevention, instead of risk-mitigation. Prevention eventually becomes exceedingly expensive, whereas mitigation is all about building robustness into the running system. Due to that, the scalability of mitigation systems, such as true micro-services or actor-systems, are inherently more dynamic and cause less latency in development.

I don't understand your last statement. It seems to confirm my position: "... anybody who sits down is shouted at ... ". The process (standing up, not sitting down) is less important than good team dynamics (not getting shouted at).

(edit: down-voters, please share why you down-vote! I'd like to know. Also, please don't down-vote based on opinion, but on weakness of argumentation instead.)