I like TypeScript for its types and type-checking, but I also want to write JavaScript to avoid having a local build step, and having to wait for things to transpile/compile/etc when running locally. I have a pretty large project where I've gotten both worlds by just using JSDoc and only using TS for type-checking. VSCode still offers built-in type-checking with JSDocs and ofc the type-checking can also be run separately if needed.