For some people, the ability to use wired headphones/earphones while charging has a lot of value. Additionally, some invest in quality earphones or IEM's and replacing those with the lower-quality limited selection of USB-C earphones is not desirable. Likewise with Bluetooth.
The 3.5mm audio connection is nowhere near dead yet.
FWIW for IEMs with detachable cables, which pretty much all of the good ones do, you can get replacement USB-C cables now. That has the advantage of decoupling the sound quality from the highly variable quality of the phones internal DAC since the DAC is instead part of the cable, and some of those cables even have configurable hardware DSP features. It doesn't solve the charging problem though.
Unless you own the product and know it has that problem I don’t know why you would invent it out of nowhere.
Can we also acknowledge that this is a general purpose smartphone and not an audiophile playback device? A ton of phones with headphone jacks had/have terrible DACs because they are general purpose devices designed to be good enough for the average person.
Someone who wants an audiophile playback device should buy an audiophile playback device.