They made it almost perfect, The usb missing is key, just to be able to use the mobile, Mac or iPad charger anywhere, even in a trip or a simple power bank with a long usb cable it'll make it perfect. I'll wait for the newer version, perhaps there is some way to reach Neewer and give some feedback about this.
You can absolutely use it with DC when in studio. I more meant when you’re on a location shoot without easy access to power. But studio is fine when on DC
Hey, yep, you can definitely use it while charging. Which is how you’d want to use it wall mounted as part of your set lighting (if that’s your use for it).