Topping D10s DAC auto standby?

[Falco]

Yes I agree, with the remark that on the RPi4 you should connect your usb DAC to one of the black USB2 ports

Yes.
Now, the "only" problem I see for a RPi3 for example, is that you will have the DAC and possibly an external SSD connected...
Switching the DAC off will also power the disc off...
(on the Pi4 you may just connect the DAC to the 2.0 ports, and the disc to the 3.0 ones and you're done)

Indeed, would be yet another argument to use a RPi4 for moOde, for the ones using an USB powered DAC that is. But I guess the actual power use benefit is rather small, with my topping D10s the main benefit is to shutdown the display.