[isaacaggrey]

They do help if a single team of 5-7 developers own a set of microservices; it's unlikely you will have tons of PRs to merge all at once in a single repository with a smaller team. Granted, the ownership is is a bit more clear when talking about a self-contained system that a team owns: https://scs-architecture.org/vs-ms.html

In the SCS literature, you would integrate via async mechanisms across SCSes, provide versioned interfaces, and enforce via consumer-driven contract testing like Pact: https://pact.io