To be fair, what other simple way is there to send a document to a contact through an e2ee channel? Mail + PGP/GPG? Wormhole?? openssl???

Sending it via WhatsApp (which also has desktop clients, btw) strikes me as a perfectly reasonable solution. (Which is somewhat of an indictment of the current state of cryptographic software, but that's a different topic.)

This exact scenario happened with me in a prior job. Invoices, payments, everything could (and sometimes was) sent through WhatsApp. It was absolutely shocking to see people do this.

Some European governments are effectively run via WhatsApp.

maybe China is right: one app to rule them all

I witnessed a cop attempting to manipulate some files I provided to him on a thumb drive. It was a slow laborious process of dragging files one at a time from the Windows image viewer to shared folder. I would have liked to just do a Ctrl-A, Ctrl-C, Ctrl-V, but that was way above his level of thinking and he didn't seem like the type who wanted an education. So I just sat there through the long, painful process--and then at the end he completely screwed up the report. Idiot.

Yes, I think "Gen Z doesn't understand file systems" is at least partially an indictment of file systems.

Hierarchy was always a poor substitute for tagging. You have to either decide a bunch of arbitrary parent / child relationships to encode your tags in a deep directory structure or just stuff them all into the file name and filter with regex.

I actually have similar frustrations with emacs org-mode. I get paralyzed by tree-structure decisions and I'm realizing that a tree structure is just not what I want. A flat collection of knowledge items festooned with every conceivable piece of metadata that might help me find them later is.