Using YACC doesn't give you magical integration with IDEs, operating systems, testing, documentation and so on. I feel as if you took my specific comment about

Using YACC doesn't give you magical integration with IDEs, operating systems, testing, documentation and so on. I feel as if you took my specific comment about parsers (which are not hard to write at all, few hundred lines of code for a moderately complex language) in an inappropriately general way as in "don't use anything for anything when doing anything".