[SillyUsername]

Isn't this the same as AWS step functions?

Maybe I missed the party trick but under the hood a step function definition will be orchestrated between lambdas (the services).

The only difference to this pattern is you define event inputs and outputs on the service, as part of orchestration, which I feel is absolutely needed to know by consuming services (why wouldn't you, unless you're hoping to avoid object versioning / changes clashes of services by doing that, which is better served by you know, actual versioning tags...).