Following this to its logical conclusion… “Sorry, you didn’t buy a Development Pro Guitar. Please bring it in to your nearest Apple repair shop to get it retuned or restringed”
See? “Development machine” just means the ability to do what you want with your own machine. No third party interference.
Let Timmy Can’t-Tune bring his guitar to someone who can. Let grandma have her new phone be setup by her grandson appropriately so she can’t install malware.
Freedom. Digital rights.