> Spring framework when stuff like Django, Rails, or the Go ecosystem exist.

Django and Rails have a very similar model to Spring, so frankly this is just "I was lazy to learn a new tool and it must suck" kinda take. Is there a learning curve? Sure. Does it worth it? I would say for typical CRUD stuff, yeah. No matter how trivial it is you will likely end up needing something that is a single annotation away. But you may want to try quarkus over spring.