It's always a challenge to choose or even change a microservices framework which satisfies your requirements. Obviously it needs to have small footprint and fast startup time. However different developers have different requirements. Some of them prefer functional, reactive style of APIs with full control. Others don't want to live without IoC and prefer declarative style APIs like in JavaEE.
Come and learn about project Helidon which fulfils varying demands and can be your powerful tool to develop cloud native applications.