Return to supplier creating shipment lines with the status as staged

Summary:

Hi,

While creating return receipts i can see that the stock is depleting immediately after submitting the return, but i can also see that shipment lines are being created with the status as staged. May i know why the shipment lines are created and once the stock is depleted do we need to create shipment for the shipment lines created and need to do the ship confirm mandatorily?

Also shipment lines are creating by any setup or opt in feature enabled and if we don't want shipment lines to be created and do the ship confirm, what is the impact, will there be any impact on accounting?