Testing a multi-cloud app locally: LocalStack, Moto, Azurite… or one tool for all three?

If your app only talks to AWS, LocalStack is fantastic. But the moment a service reaches into GCP or Azure, local development fragments: you bolt on Moto for extra AWS bits, Azurite for Azure Blob, and the gcloud emulators for Pub/Sub and Firestore. Three+ tools, three configs, no shared state, no s