Well, Hawkeye/Shotspot are not 100% accurate !!
So here comes another question : what is the purpose of Hawkeye, if it's not 100% accurate ?? I mean, why not (for TV) just showing the replay instead of a technology that can be wrong ? And it's not told on TV that these technologies can be wrong : to people, it just shows the truth.
Hawkeye/Shotspot can sometimes be really confusing!
And I remember a match, I don't remember exactly when it was : but, in that match, everytime Hawkeye showed there was a bad call against a player (cheered by the commentators etc.), the TV used Hawkeye to show it, and for his opponent, nothing was done, no Hawkeye, especially on some important contentious calls, when this guy was right. (I hope, you understand what I mean).
So at the end, we had the feeling that a player (the one the commentators supported) was cheated, especially since he lost, even if it wasn't really the case.