This is correct. I believe the above reference to expo reducing travel is referring to instances where people are not using the whole range. I made it through a whole first season of flying without knowing I should be using full range of my sticks. With small stick inputs, expo actually reduces the amount of travel of the surface. It catches up with larger stick inputs to equal full travel for full stick input.

The idea is to set up your radio so you are using full range on low and on high rates. You will get more consistent results (roll rates, etc.) and have more room for correction and better control of stopping points. It also would mean full servo travel for desired deflection, and thus reduce strain on the servos.