I've worked on a project that was fully event-driven realized as Microservices. (I think a few of the externally connected Microservices were event-driven as we

I've worked on a project that was fully event-driven realized as Microservices. (I think a few of the externally connected Microservices were event-driven as well but not all.) That was all roll-your-own without framework. So things could break. But the philosophy was more like: everything is written in a very lightweight and simple way. So if it breaks, it can be fixed swiftly. I've also seen a similar approach at another place. FWIW both places had unusually high availability requirements. ("Fail fast"...)