It's not just a dealer only or Volvo thing. Most techs everywhere are paid by the job so they're only earning money if they're repairing a car vs standing around doing nothing.
An honest tech who knows the product should be looking for any potential problems as that's what you'ld want. You'ld rather know if your car needs brakes or has safety related issues vs being ignorant yet a greedy or dishonest tech might exagerate.
Being an experienced tech myself, anything I see wrong with a car is something that I can prove. If any customer wanted to see exactly what I was talking about, I could easily show them.
If you doubt or distrust the place where you take your car, just ask to see the car and have the tech show you exactly what he's talking about and why.