time-ex:
What are the drivers to return damaged aircraft to service? Loss of revenue, loss of manufacturer prestige, the insurance companies who have to pay out? Higher insurance cost for this type of aircraft? A new aircraft expected to fly on for more than 25 years damaged in its first year of operation? a combination of all these probably.
Yes, all these, plus the total cost of the repair (including EW gain, special recurrent inspections, ...) compared to the "as-repaired" market value of the ship, and the alternative market value of parting out the ship for LRUs and major components.