[mixmax]

The basic problem is that if you ask 100 different project managers what they want you'll get 100 different answers.

Every project manager (I'm using a very broad definition of project manager here...) wants a system that is almost but not quite what someone has already built. "Ohh this looks nice - wait I can't do X? Then it's totally useless." X is different for everyone. Some people can't live without a versioning system, some pople can't live without tasks that have a sign-off field, etc. There are literally hundreds of ways of doing it.

Nobody has solved this problem yet. Probably because it's extremely hard.