Because FTK Imager is an imaging software, not a duplication software.
FTK Imager is able to copy all the bytes from a drive into files on a destination drive, whereas a duplication software/system such as dd, dcfldd, Solo4, Logicube Quest, Tableau TD3 is also able to duplicate the drive, including unallocated space and making the copy bootable (if the source drive is bootable of course).
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