I'm not sure about your first question, but it's probably due to marketing more than anything.
The second question, however, has a factual answer. Any measurement ALWAYS has an uncertainty associated with it (in fact, it's helpful to think of a measurement as a statistical distribution rather than a number), but sometimes you don't really care about the uncertainty because you're not using the meter's indicated value for anything. Maybe it's a sanity check, maybe you just care if you see a voltage or not, maybe you want to see if the voltage is within a certain range. If you're not planning on using your meter's exact displayed value for something, you can call it an indicated value.