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
While thats all interesting to read, you are adding in so many additional variables, we aren't talking about whether the game is too big or not anymore, we are talking about how you are slowly being buried in debt and at the same rate running out of things that make you happy.