The only thing I can think of that I have relinquished is the claim for a price drop. Booking group rates with a TA, there are almost never any price drops because your initial fare is so much lower.
I email my TA, tell him exactly what I want done, and within a couple hours it’s done, I am
fully in control. I have no desire to sit on the phone with customer service, I have far more important things to do.
Most anything I need to do, I can do online by myself.