Is the upgrade all --outdated a new CLI flag for V19 that will update any module which has a version in the manifest newer than what is recorded in the database? Or is this for upgrading between major versions? This is very confusing, as the official documentation mixes the use of "upgrade" and "update" throughout this section. Odoo needs to do better at differentiating between the two terms.

I hope it does just update the modules based on manifest version differences. I like to keep my production installs updated, but I don't trust Odoo enough to do this without a human in the loop, but running python3 odoo-bin -c odoo.conf -u all --stop-after-init is a bit slow, and it loops through a bunch of module updates that don't really need to happen.

If so, it would also basically eliminate the need to use something like this module from OCA except in the case of a development server where you are making changes without bumping the version until you have a finalized version

https://github.com/OCA/server-tools/tree/18.0/module_auto_update