I cannot answer that directly, since I've never used parser combinators. The general problem is that there's so much software out there to learn that most peop

I cannot answer that directly, since I've never used parser combinators. The general problem is that there's so much software out there to learn that most people are happy when they know yacc-style and antlr parser generators. Also, most people are regularly disappointed by software that over-promises, which costs them a lot of time. So they stick to what works for them. In my case, I find Bison/Menhir such great tools that I have zero inclination to even look at other things. EDIT: A corollary to this is that people who are very productive (Thompson, Torvalds, Bellard,...) don't constantly change their software stacks.