This works for services that are growing slowly in features or have few other services integrating with it. I’m not sure how this scales when there are multiple

This works for services that are growing slowly in features or have few other services integrating with it. I’m not sure how this scales when there are multiple services across multiple teams with dependencies on one another where services are being rapidly developed with new features. At work, we have staging/pre-prod environments across most teams that my team works with so new features can be tested in staging and other teams can test integrating with it. This is also possible to do with just a production environment but requires some engineering effort to add feature flags and special headers indicating a request is from a team looking to try a new API.