alt Hacker NewsTDD and similiar test paradigms have all the same fundamental flaw -> It's testing for the sake of testing. You need to know exactly what you want in order to start, which isn't compatible with a competitive iterative workflow no matter how much TDD yells otherwise. TDD doesn't make sense in agile and fast iteration workflows, only in heavily regulated / restricted products.
It certainly isn’t. It is more a way of discovery on how to implement something, with the benefit of being able to safely (and thus easily) change it later.
The 99 Bottles book by Sandi Metz [0] is a good short display of how it works and where it helps actually building maintainable software
[0] https://sandimetz.com/99bottles