Because nobody wants a parser anymore. Or rather, the majority doesn't want it. Going through all the work to create a parser system that is more responsive and reliable than Sierra's would be too much work for only a small minority who would enjoy it.
At IA, we were actually throwing around the idea of having both a parser and P&C interface for SQ2, but we decided against it for the same reason. It's just too much work when only a fraction of the audience would actually use it.
Originally Posted by TomPravetz
This is the internet and you made a typo. Therefore, I won this argument. My opinion is now fact.