His reason is that if he can program it, he is no longer at the whims of the manufacturer. They decided that two timers were "bad UX?" He can theoretically add it back in.
I used a bullet journal for a while for the same reason. No longer was I waiting for an update to a todo app, or voting on features. If I wanted to add a "feature" to my todo list, I was in full control of doing so.
Honestly, the iOS tweaking community is a great representation of why you should be able to have control over your devices. Over the years many of these tweaks have been integrated into iOS as standard features. Granted, many of these were "duh" features like wallpapers, custom keyboards, Control Center, wireless iTunes syncing, etc: https://ios.gadgethacks.com/how-to/60-ios-features-apple-sto...
I used a bullet journal for a while for the same reason. No longer was I waiting for an update to a todo app, or voting on features. If I wanted to add a "feature" to my todo list, I was in full control of doing so.