Yes, I think being little extreme either ways is bad. If TDD makes it hard to test certain new thing we are implementing, maybe do it some other way.
I've found functional style of programming, or just decomposing functions into smaller functions, often work better with TDD. I'm personally not as much into pure TDD, as much as writing code that can be tested quickly and easily. In the end, what I want is when I'm writing code, I should be able to quickly run that specific piece of code and verify the some basic scenarios, instead of waiting a minute to push to cluster, another couple minute starting whole process and then running actual test.
