They have to go somewhere. Perhaps if a store went to a curbside-only model they'd organize things in the store based on popularity so the people fulfilling orders could be more efficient, but it still takes people working throughout the day to make that happen.
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"they're restocking and doing other administrative tasks. Most of those tasks don't just go away when you move to a curbside pickup model"
This may be true in practice, right now, but do things really have to go to the shelves and then the curb?
They have to go somewhere. Perhaps if a store went to a curbside-only model they'd organize things in the store based on popularity so the people fulfilling orders could be more efficient, but it still takes people working throughout the day to make that happen.