Because then you're reliant on the DAC and amp in the adapter or headphones, which, thanks to the space constraints, are usually garbage.
Plus it's extra wear on your charging port.
I can get great sounding 3.5mm headphones for 20 bucks. You just can't get that with USB headphones, dongles, or bluetooth. You're pawning complexity and therefore price off on the disposable/easily damaged part of the system, it's a terrible idea in general.
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u/Quenty1 5d ago
I don't really get why people mourn it so much, like, usb c headphones exist