i don't think you can really say this is ever necessary. or at least, not that microservices make it necessary. this is a business thing. you need this when

i don't think you can really say this is ever necessary. or at least, not that microservices make it necessary. this is a business thing. you need this when you're hiring a contractor to add some functionality, and you don't want them to touch the service behind the ambassador. probably because you've hired a different contractor to build the original service, nobody at your company knows how it works anymore, and making the new contractor figure it out is out of budget.