It's certainly more verbose but certainly not a limited subset. You can copy paste any typescript Type or Interface in a jsdoc @typedef. As I stated in the article, it's still the TypeScript language service that's analyzing either JSDoc-defined types or TypeScript defined types. It's typescript all the way down

But JSDoc lets you do pretty much everything that isn't a runtime feature of TypeScript (e.g. enums, namespaces, etc). Even generic slots are supported

Although it's more verbose, it makes code less dense because it lives outside the function parameters.

Also, it's not a super limited subset. For instance, you can write types in .d.ts the IDE uses those types in jsdoc out of the box.