Like it or not, confidential and trade secret documents pass through and are edited on Windows machines, among others.

Not my point. TFA is writing about the importance of security and privacy, not me.

You seem to be missing the point. Your complaint is that it runs on Windows, which fails to take into account the target audience of this (lawyers) who most likely are running Windows. So TFA is about the "importance of security and privacy" even on Windows, since the application is only available for Windows.

It's not reasonable at all.

Could you elaborate on what part you find un-reasonable, and why?

Yes, you are missing the cost of complexity and network calls. You are describing a distributed monolith. It does not help.

Not sure I understand. What is a distributed monolith?

I'm not suggesting that the distributed bit is still coupled behind the scenes ( ie via a data backend that requires distributed transactions ) - the interaction is through the interface.

In the end you are always going to have code calling code - the key point is to assume these key calls are simply data passing, not behaviour passing, and that they can fail.

What else is need to make something network friendly? ( I'm suggesting that things like retries, load-balancing etc can be hidden as a detail in the network implementation - all you need to surface is succeed or fail ).

...and they don't care about security.

Bending fingers so much during use is bad for your tendons and ligaments.

true, a version where you could keep your hand flatter would be nice, though not as compact

100% wrong

Yes. It's implicit. Goodbye security indeed.

If anything, Tor Browser is much safer.

GCC is the way.

It's not enough. It needs enforcement and whistleblower protection.