BigRed, I place new RV issues into two catagories, 3rd party components and trailer quality.
As far as 3rd party components, take BellaGrace's issue with her slide as an example. Same slide you'll find on many manufacturer's RV's. It worked for BellaGrace before, so it probably worked for PT before it left the factory and also at the dealer when they checked it out after arrival and during PDI. So what can any manufacturer do in that situation? The only thing they can do is fix the problem correctly and as quckly as possible. As you noted, PT is excellent at that.
When it comes to trailer quality, then the manufacturer is solely responsible. Look through the post in PT's section of this forum and I think you'll find very few issues with trailer quality.
BellaGrace did mention a couple of issues, some trim work and carpet, that shouldn't have left the factory in the condition they received it.
I and another 303RKS owner mentioned a small leak around our bedroom slides, but this was only during a hard rain with high winds and come to find out both of us had our tt's slightly out of level, curb side high. Leveled the tt and no leaks now. Even in hard rain and high winds.
There have been a few tire clearence problems on one particular model and one owner who has the same tt as I do has had quilte a few problems, but PT is taking care of everything no questions asked!
I do agree with you that we shouldn't have these problems with a new tt, but we do. However, I do feel it's hard to blame any manufacturer if a 3rd party component doesn't work, if that component doesn't have a history of excessive malfunctioning on a regular basis (about every component has failed at one time or another) and if that component worked properly during the PDI.
PT has listened to their customers and has added or deleted features based on the needs/wants of their customers. So I feel they're doing all they can do.
I would like to note that I haven't read or heard of any PT trailer with roof leaks or delamination problems.
So JMHO, but I feel PT is outstanding in customer service and trailer quality.