There is a difference between re-architecting a whole monolith system into microservices and doing TDD. The former has a very significant impact on the cost and duration of the project; the latter doesn’t, as long as developers are comfortable with the technique. Whether or not developers automate their tests should not be relevant to the business. It should be even less relevant whether the automated tests are written before or after the production code. What business should care about is that the lead time from business ideas to software in production is gradually reduced.
