"Without persistent qubit memory, a quantum 'computer' is a misnomer."

Can you please say more about this?

The first personal computers had no persistence at all. Then cassette tapes. Then floppy drives. Then smaller floppies. Then hard-disk drives. Then solid-state drives (SSD).

But they've been computers all along.

Why can't quantum computers use existing storage technologies to persist the data on which they operate and which they produce?