JSX syntax doesn't change every month either. React itself, as a library, has a great deal of backwards compatibility.

What does churn is the tooling (e.g. abandoning Webpack for Vite). But the actual API and syntax has remained virtually unchanged. You can still write and use class components today. Hooks themselves are nearly 7 years old at this point, with no sign of changing. You are not required to use "server components" or any of the new features in React.

Meanwhile people in this thread recommend "simple" alternatives like Vue that produce breaking changes so massive it splits their ecosystem in half.

I stopped writing React for probably 2 years and now the whole framework is different and I have to relearn the entire thing. Defining a component is completely changed, changing state is completely changed, and the component lifecycle is completely replaced and it feels like the complexity of the framework has gone through the roof. At least for me this is the type of churn that makes me not want to do it anymore.

React is 11 years old (older now than jQuery was when React was first released).