And you immediately lose the ability to do `crontab -l` on any server to know its scheduled tasks.

Now you get to look around the myriad of places where you can put systemd files, and figure out which ones are base services and which ones are custom, with no general convention to go about it. Nope.

If you had read the article, you would have seen its answer to this.

systemd list-timers

With —-all