I think this thread reflects a simple fact: people use the Showcase for different reasons.
If you aspire to modern professional productions you will need to know your way around pitch correction. If that is not your aim, then you don't.
Pitch correction never has written, played or sang a single song ... and never will. It is simply a sophisticated tool to create something, a near perfectly pitched vocal, many people have come to expect.
What is and always will be much more important is writing, playing or singing a song.