Mta88 Thank you!
MrGr My unscientific observations are:
1) In general, outside of specialized forums, and with nothing to compare to, no one picks up on the synthesis aspects... Pianoteq passes for a regular piano.
2) It's getting harder and harder to identify Pianoteq vs non-Pianoteq, not impossible, but more and more people are getting fooled or confused even on the specialized forums.
3) People accustomed to acoustic pianos are perfectly content with Pianoteq, transition seamlessly, and even prefer it over other digital alternatives.
4) Some of the best sampled VIs are starting to sound more and more like Pianoteq. The VSL 280VC comes to mind.
I agree with your sentiment, that in the end, it's all about the music and making music. Garritan CFX and Modern U are satisfactory by all accounts. Collecting VIs is not a particularly fruitful pursuit in itself.
All things considered, Pianoteq seems to provide me with some additional musical value... I've had fun being able to customize my own piano to suit it to particular pieces.