My wheel may not fit your hub. While I agree that rebuilding systems is a bad idea, it's also very difficult to get every square peg to fit in the square holes we intend to put them in.

One of the bigger problems that could be solved now -- is coming up with a system that gives programmers more insight or code when they are working on a given problem. Until now, it's a crapshoot trying to find, say, a jQuery module that does tooltips in the way I need them displayed.