This is a constant trade-off to find. How in organizations give autonomy while ensuring some consistency? A couple of ideas.

Interesting heuristic to improve code structure. I definitely recommend. As every heuristic it's not a law though, don't overdo it either.

This is a well balanced view on the Rust ecosystem as of today. It highlights fairly well where it shines (safety, predictability, bugs found early) but it also mentions the current issues linked to its maturity.

Good summary that TDD is many things... it helps for quite a few dimensions of writing code, still, it's not a magic bullet in term of design. Your software design abilities are crucial to practice it well.