The only things those frameworks offered were compile-time dependency injection (Spring injects at runtime, and can make startup slower)... and support for building AOT native executables with GraalVM (Spring couldn't do that before because Graal has poor support for its reflection-based dependency injection).

Within a few months of Micronaut and Quarkus emerging, Spring started working on the "Spring Boot Native" project. Allowing you to build AOT compiled native executables with GraalVM. That’s now fully released for production if you want it.

Ironically, aside from perhaps some "serverless" applications where startup time is more important, the traditional JIT applications typically outperform AOT native executables. Especially in the kind of long-running server tasks that Java is mostly used for in the enterprise. This is mostly about marketing and appearances, because newbies see the eye-popping AOT startup times (for "Hello World" demo apps), and Spring has to keep up with those bullshit examples.

But the point is that Spring DOES keep up. The Java enterprise ecosystem is at a point where occasionally something new gets introduced, but then Spring adds support for the same thing within a year or two. Since "a year or two" is a snap of the fingers in the enterprise world, there's just little incentive to migrate just because a new thing is "cooler" on Reddit. Especially when the new things have a minuscule fraction of the community, working out the bugs and producing the blog posts and StackOverflow answers that you rely on.