I had a TSB performed (without my knowledge) while taking my car in for oil change. They advised it was performed and documented on my service receipt. They installed updated door sills of some sort on my Mazda6 to replace ones with sharp edges they could cut your skin.
Fact is if that service advisor is familiar with a known TSB (either through trending complaints or perhaps an email from corporate) they will perform it. Correct me if I'm wrong but aren't TSBs' are more service money for them? They benefit from that and from a more happier customer.
TSB is money but it isn't the most easy money. Most easy money is Fuel Induction Service for 120 bucks on a car with 20K miles on it. If you do it or watch John Oliver talking about WWE on YT most customers would not know about it. You get $120, your mechanic learns about Wince McMahon and your customer is happy going home saying I got Fuel Induction Service. Changing cabin air filter on every car that comes in the bay for $45 is easy money. Changing AC Vents with a TSB where Mazda pays for 30 minutes of work where your mechanics are so god awful it will taken them 2 hours to figure it out and another hour to do it - is not easy money. A dealer here in DFW conveniently disconnects every time I say TSB. So TSBs are about avg. in making money. Pushing unnecessary service like 3K oil changes etc. are easy money. If you only got 3 semi competent techs working they are more interested in drivetrain and big ticket items than trims / squeaks etc.
And to point out - every brand has good and bad dealers - agree but what fraction are good? Did you even read the Jalop article? Mazda dealer saying he "builds" the car in his bay as the car from Japan does not come fully built. That is some dope level s*** - like the Hyundai dealer saying he cannot remove the cargo net because it comes installed from Korea - like dude its in a bag in the trunk. Its not installed whatsoever.
If I aggregate my dealer experience - Mazda is probably in the ballpark of Hyundai. Not kia / Mitsu level awful but awful nonetheless. Lexus didn't become lexus if their dealers were as crappy as Toyota / Nissan. If Mazda is pushing the "eco premium" crap then dealerships are part of the equation. The other thread where this dude's car was stolen because he used roadside assistance - just tells you they are overall behind in the entire supply chain.