You don't have to use bluetooth for audio. Every iPhone comes with an aux port adapter for a reason.
We move from a world where you can buy any set of headphones, and use them with any device, to a world where... nothing is compatible with anything else. Either you use a permanently connected dongle, or you buy multiple sets of headphones.
The future is stupid and I don't want to live in it.
How is an aux port obsolete for the task of transmitting audio? It does the job simply and perfectly, with a tiny connector.
I want to use any piece of stereo equipment made since the 1960s. That's a dongle.
Why don't we just ditch USB C too. Wireless charging and pairing via wifi/bluetooth.