As well as all your points (which I 100% agree with), my other issue with these dongles is simply that they stick out way more. If I buy a pair of headphones with an angled connector, I can plug them in and wrap the wire a little bit and then when the phone’s in my pocket, the wire takes up basically no space and doesn’t get smushed about by my leg.

With a dongle, I need an extra couple inches of vertical space, and because the wire/connectors are sticking directly out the phone, they get bent all over the place. Absolutely crap design. Yes 90 degree USB-C to headphone jacks exist but they take up way more space than just a headphone jack.