Subtle. Very good.

SharePoint and OneDrive folders can be synced locally. You get a local copy of the folder in online mode, so files are only downloaded if you specify, or if you open them.

Once you get that sorted out, you can stop worrying about where the file lives.

Switch “companies should adopt” for “the federal government should mandate” and you might be a bit closer to what you need.

Expecting companies in the US to voluntarily make your life better is a hiding to nothing.