how would you export a static site if you are running on the browser? you can do some cache management with local storage, or just leverage the browser built in system, but as every rendering session is on the edge, you would not have the benefit of a static site.

Or are you talking about, developing it on the browser, export it and upload it somewhere as static files for internet access (eg a cheap host with no server side languages)?

Tools for that purpose already existed, e.g. WP2Static.

Sure but you had to install wordpress on your PC: hard or server: easier but cost $ on top of the static hosting bill

WordPress is both free and open source, what are the extra dollars for?

If you don’t run it locally, then server rental.

Same with this