to be honest i just do not get why on earth dap makers choose such old components to begin with, I am really wondering what is the reason behind their decisions.
At the end of the day cost. Everything is built down to a profit, not up to performance. Sad but true. It's also been stated that the dedicated dap market these days is very much a niche. As has been pointed out before most people are quite happy using their phones as music players so no need to carry around a second device just for one purpose.