One should be at the bottom one at the top. I understand space on the phone is a premium but a second port would make the phone so much more usable. Wired headphones, flash drives, camera modules, speaker modules, keyboards, even connection to a TV, all could be used while charging. It’s a shame it’s not a thing, USB is extremely versatile port, but you only get one and it’s used for charging half of the time. (I am aware dongles exist)
Can USB hubs even allow the phone to be charged and simultaneously control things through the same port? I know I tried that back in the USB2 days and found it infuriatingly false, since had set up a wired USB mouse and game controller to my tablet for portable shooters. One particular hazard is I’ve found that combining bluetooth headphones and game controllers can result in unplayably-bad latency on Android, so wired options would be nice.
I think yes. USB-C docks are the proof.
Yes they can and do. The pins are separate and power delivery is both faster and more efficient than it used to be.