One of the strongest points of using a framework is that it's easy to find other people who already know that framework. And that depends on framework popularity. It's like old motto "nobody was fired for choosing IBM".
Spring is not well suited for modern microservices running in the cloud. Its startup time is slow and its memory usage is high. There are other frameworks emerging, optimized for GraalVM native image, most notable ones are Quarkus, Micronaut, Helidon. But their popularity is nowhere near Spring. May be in 5 years things will change.
