Subaru Forester 2013 - Brake Backing Plate Fiasco

I had done the passenger side wheel bearing in the past which took days to get out and the backing plate was fine. Hindsight since this was a west coast car with minimal r*st now driving in the east I should have replaced the brake backing plate regardless.

Last week, the rear drivers side wheel bearing went and I didn't have time to replace it and got a reliable mechanic to do it. It took him 3 hours to do and quoted an hour, he ate the 2 hours over but I ended up paying him for 2 hours because I felt bad. He said that the brake backing plate was completely gone and he didn't replace it and put the new hub assembly in. He said you don't need an emergency brake it's 2013, and NAPA might not even have the part. Usually he calls, but didn't this time. Anyways, it is what it is.

I checked and my local Subaru has the backing plate, and NAPA has the hardware and shoes. At this point it's only been a week, does it make sense to pull the hub assembly or just live with it? It's bugging me, should I just leave it since it's a 2013 and I'll probably get another another couple of years out of it. The engine was replaced at 189k with a 119k and it's sitting on 222k.