Honestly it seems that most of Web Standards are used mostly for fingerprinting - I think a small number of websites uses IndexedDB (who even needs it) for actually storing data rather than fingerprinting.

That's why expansion of web standards is wrong. Browser should provide minimal APIs for interacting with device and features like IndexedDB can be implemented as WebAssembly library, leaking no valuable data.

For example, if canvas provided only access to picture buffer, and no drawing routines calling into platform-specific libraries, it would become useless for fingerprinting.

You can use a browser extension like "Local Storage Editor" to see the contents of the Local Storage of a website. So far, I've seen it used for caching long-life images (like on gmail), or used as another way to do logins instead of cookies.