[barrkel]

"as if any bug is acceptable!"

This is the point at which I stopped reading.

Yes, some bugs are acceptable. The point of writing software is not to create bug-free code; it's to create value. The marginal returns on eliminating the last bug are much lower than implementing new functionality.

As for the gist of the post, from my experience, TDD is OK; but it is unit tests that are essential. They are far more important in dynamic languages, because you otherwise have very little feedback when you make mistakes as simple as a typo. They're also important in static languages, but fairly large programs can successfully be written with without anything near the volume of testing needed with a dynamic language.