We're using Popsicle at the Endless OS Foundation to make copies of drives used to install Flatpak'd learning apps in offline or limited connectivity deployments. Currently, our process looks like:

1. Use flatpak create-usb to prepare one USB drive, which takes a lot of time due to downloading all the apps and dependencies, compressing them, and writing them to the drive.
2. Create an .img of that drive
3. Use Popsicle to copy that .img to several additional drives

It could be handy to use Popsicle more like a disk duplicator, where it could read the contents of one drive and copy them bit-for-bit to additional drives, cutting out that middle step.