Calibre isn't really simple, but once understood, it's easier than a command line to copy and manage ebooks.
Every OS I've ever used has a simple file copy command line that will work for any ereader that uses mass storage. Mac OS might need something extra for MTP, but Windows and Linux can copy to MTP devices in a console (command line).
I've not looked at the Git offering because Windows & Linux already have command line for any ereader (reMarkable uses network over USB, so is different) and GUI file manager support.
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