It's overkill. The contractor shouldn't have done a ledger with the tongue and groove flooring. Even without the starter course on the siding their staples caught nothing. But easier to sister onto the ledger than run an independent joist. Bridging probably not needed but it made a good support to attach the outlet box. The outlet box, recepticle and cable they had installed was not wet/damp rated so it all had to go. Lots of little things add up timewise.