The idea is that precise location for 1 hour of the day and general location the other 23 hours of the day is a reasonable trade-off to ensure that professional athletes are living the life of a professional as they've been asked to do per a generally agreed upon set of rules in regards to doping. There are certain prohibited substances that can clear in less than 24 hours, which is why they want to keep the threat of being able to test someone at all times of day. I'm glad to be subjected to such a set of rules in my own life. However, if I were a professional athlete I would accept that it's part of the lifestyle sacrifice that helps me play on a more level field. It's not perfect, but it does help prevent doping from being absolutely rampant, which is especially critical in protecting women so that don't have to do masculinizing drugs to be able to compete in the sport they love and are naturally gifted at.
Anyway, I think the idea is they usually test very close to the 1 hour specific testing window, because as Jenny Simpson said, they want to find you, presumably without going through some big hassle for either them or the athlete. The testers aren't trying to be jerks about it and in fact they may be going too far the other way at times bending over backwards. That is what starts to add some potential bias to what is supposed to be a strictly scientific process. I guess that's life though, as has been said earlier.