The advantage of PEGs is that they are easily understood, easy to code, and easy to code for. In 99% of applications nowdays, these are the only considerations.

The advantage of PEGs is that they are easily understood, easy to code, and easy to code for. In 99% of applications nowdays, these are the only considerations. Performance is a secondary concern or not a concern at all. Given this, the user shouldn't have to worry about backtracking, ambiguity, or lookahead. Asking the user to have to worry about this stuff, when he doesn't have to, is not good software design. Not all of us are writing high performance parsers for complicated languages.