I think pointing out wrong serves by sterger is very good for the sport. As long as players will point out what is wrong to the judges it can change a lot. I remember I think 2 years ago at Polish open when steger was playing freitas he was arguing that freitas serves wrong and the umpire started noticing it - finally steger won the match.These things can be fixed with a culture of enforcement but it seems that people are somewhat satisfied with the ugly grey area we currently have. In any case, it is worth pointing out the impact on the match quality every once in s while especially when one player is serving with visible contact and the other is not.
BTW: last point freitas vs habesohn - amazing