What makes you a lurker?

[Taliesan]

Don't think of it as opening up for criticism but as another test being judged with the probability of constructive comments rather than the generally conservative approach given by most judges on a test sheet, it is amazing how much the marks can be improved by someone pointing you in the right direction and showing you how to really ride a test to pick up those extra marks.
I helped someone in real life fairly recently, with just a few tweaks in her warm up the marks increased dramatically when she did her second test, riding purposefully at the start sets you up for a good test, makes the judge feel positive from the outset and can improve the overall score.

That is a far more positive way of looking at it. Even though I always get nervous about what people may say I guess it is no different from submitting the test for a dressage judge to review. As you say, people will just be more open with their feedback.