Its not convenient unless you need to use it extremely frequently and can keep track of it because of that.
I barely use my adapter so when I do need it, its another 15 minutes to find it or realize it got thrown out or something. Its just not convenient. Convenience would be leaving both ports, or for headphone companies to split the end of the cable into usbc, lightning, and audio jack
He’s free to do something to try and prevent it, as long as it doesn’t hurt the cat and its a wild cat