Glad you've got it working!
By the way there are storage devices that do not use partitioning, such as floppy disks, magnetic tapes, and optical media. But most everything else does.
Yes, you can provision a disk drive without a disklabel, or an MBR, or any other partitioning schema. But this is not an operational best practice. If the leading sectors of a device are not recognizable, it is possible to accidentally overwrite its contents. This is why the GPT standard includes a "protective MBR" in sector #0, so that a system which does not recognize the GPT might recognize the MBR, and the system (or its human) might stop themselves from scribbling on it.
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