you dont write letters as pages of markdown bullet points?

probably because they already own it.

use some file system with snapshots and differential backups, like ZFS, and snapshot it daily. Stream the diffs somewhere they can’t login to and which doesn’t mount the FS.

This will invariably save their bacon at some point.

I got news for you:

• X11 has seen many extensions, competing standards, fragmented implementations, ambiguous “best choices” for users, etc.

• MacOS and Windows have seen many API changes, deprecations, even wholesale language and architecture swaps.

• X11 is a 40 year old architecture that is far from optimal.

• The people doing the work set the standard in the Free Software world. They stopped working on XFree86.

• Part of the friction getting linux on the desktop is due to X11.

• You can still run twm and X. No one is stopping you.