Anyone working with a SOM, for example, will want to customize the DT for their carrier board. And then your EE finds a cheaper controller chip somewhere. And then your display supplier switches captouch parts on you mid-production.
Sorry, was I venting there?
(And just a tip, don't break bad on the Pi here. For many people this is the only ARM platform worth working with. And definitely don't make fun of the lack of peripherals on the thing)