If, to save money (removing a DAC stage not expensive here), we might as well remove the screen, an expensive element that requires a lot of resources and make electronic pollution, etc....

We have the information on our phones and tablets anyway.
(does not prohibit taking care of the quality of local regulations...but outsourcing the power supply...whether for the choice of the technical approach, or even distance from pollution, but also for the durability of the machine (power supplies being a source of fragility) is in reality probably a good thing. .. ;-) )