I can appreciate your thoughts on a plane being set from the factory, but my general rule is in God I trust, everything else I verify. Mistakes can always be made, QA can always miss something and for every pilot we should always check all of the basics of a new aircraft before flying. It would seem to be a good general rule of thumb, (not that you were at all) but everyone should always learn how to set up their own plane properly and never assume everything is right because someone else says it is. Unless it's a high quality builder you have great trust in. Check it, know it from top to bottom, if for nothing else always for safety. How many times do we do a check when everything is fine only to find something, some damage or weakness or anything that makes us stop and think, wow I didn't even know that was happening? I've been very lucky to have most every plane fly straight and true off of the bench, but I attribute it to triple checking everything with great care and it's always paid off.