Laser light treatment for post-surgery incision?

Maya just had surgery yesterday to repair her ACL. This is a new vet since our regular one didn't perform these procedures, very highly recommended and good standing in the community. They gave me an estimate of the pre-surgery x-ray and also the procedure itself, we're in the $2,000+ range. When I dropped her off yesterday morning there was another woman dropping her dog off for the same procedure (travelling surgeon was in that day) and they offered her and me a 'laser light treatment' for the incision site for $20 extra and said they have had better results with healing. We both opted for it of course.

It felt a little wierd, like I was being sold undercoating at a car dealership. Not to say that I felt it was as useless as that, it just felt odd. I mean if it is really a benefit why not just include it in the procedure- whats $20 when I am spending $2K+ ? I am thinking of giving the owners this feedback. I tried an internet search and really didn't come up with much, was hoping to get some informed opinions here maybe from a professional.

The procedure went fine, the surgeon called me right after and filled me in. We went to see her last night but that only lasted < 1 minute because as soon as she realized we were there she started whining and trying to get up. I pick her up in an hour and the rehab begins.