PC World has an article on why USB-C has not been a viable alternative for the 3.5mm audio jack. Problems with USB-C include variable handling of digital to audio conversion, incompatible SOCs inside the cable, and non-standard analog-passthrough. In short, the cables which contain computers themselves are not standardized in behavior and the author's conclusion is that mobile devices must have 3.5mm jacks until the USB-C cable technology gets sorted out enough that they become usable.
(Score: 5, Informative) by Anonymous Coward on Wednesday September 12 2018, @05:29AM
"Does anyone actually use a headphone jack in their phone at all?"
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Yes.
Note : if you ever become an adult, you will learn that the needs of others may be different from your needs, but no less valid than your needs.
If you don't want a headphone jack, then you have little to contribute to this discussion, so be a smart boy and shut up.