Earlier quoted context omitted.
But why? What's wrong with Bluetooth?
latency is absolute killer. then there's also the fact that splitting the output is difficult, pairing (especially multi-pairing) is finicky but the real response is "what's wrong with a usb-c to 3.5mm adapter"
I think it just adds friction (for measure, I feel audio jacks are pretty good)
So the real response is, "what's wrong with most companies to not provide the 3.5mm itself?"
It's good that xperia's doing this though. I think I still have phones which have 3.5mm itself so there isn't much to worry about. I think there are a lot of new phones which do offer it, I think both of my parents phones have support for 3.5mm by itself.