Your post makes it sound like you consider this a bad thing?

Are you implying that the lack of data harvesting is a disadvantage?

I don’t see the downside here.

If you don’t believe it, maybe disconnect from network before dropping the file?

sound great

well makes sense if JavaScript is run 100% locally.

Browser can be treated as loader of code to be executed only locally with Local only data.

i hate js, but it's doable