>If you do it right, the tests are trivial to write and are very short and disposable (so you don't feel bad when you have to delete them in the next refactor).

The raison d'etre of TDD is that developers can't be trusted to write tests that pass for the right reason - that they can't be trusted to write code that isn't buggy. Yet it depends on them being able to write tests with enough velocity that they're cheap enough to dispose?