I perpetually loose my headphones anyway. If I had an adapter too, I'd find myself unable to listen to anything twice as often.
Shouldn't such an adapter have a female USB-C connector and pass that through to the male one, with the headphone jack being branched off? Do those not exist, or are they prohibitively expensive? Did the Apple "dongle" mentioned in sibling comments do it that way? (Sure oughta, IMO.)
I can understand the complaint about charging. Although the fanboy answer is of course wireless charging.
The next thing to go will be the physical SIM card tray - takes up a similar amount of space which is better utilized for battery capacity or other features, and also makes for easier waterproofing if removed.
(Btw there are 3.5mm to lightning adapters that let you charge while listening, just not made by Apple)