Although I can agree with most of what's being said, I just wonder what and / or from where AB will produce a Silver Bullet to increase the already reasonably good sales of the C Series without an expensive redesign of FBW systems and crew interface, because without those any attempt to sell 'commonality' with other AB products is most likely a non-starter.
So good as the C Series might be, it's still going to have to be sold as a stand alone model in the AB catalogue to existing AB operators.
Maybe AB have seen an opportunity to improve production rates as the deal clincher as far as they're concerned.