What's the use case of JSP in this modern world?

We know that JSP is for rendering html on the server side in the Java web world, which is essentially transformed by the container into servlets. There're sort of things called actions, tag files, etc in JSP to help enable Java functionality while keeping a declarative way of html construction. As far as I'm concerned, the assets JSP send to the browser are the plain old standard html tags that can be understood by the browser. However, if this is the case, does it mean that we're confined to the old school methodology of building websites？ What's the difference between what we said about server side rendering with react and nodejs and the JSPish way of doing things in the Java world? How to integrate the build process for the front end in JSP (or is there a need for that)? What's the use case of JSP for the time being?