When you get right down to it, even email is open-endeded:
“What do I do?”
“You can send a message to someone.”
“Well, what should I say?”
“…Anything?”

It would help to say it’s a planning software, though.

Also, if there’s one thing I’ve found out from my repeated exposure to Google’s open alphas (whatever they call them, they’re basically pre-beta) is that the not-so-bright users will complain about how it doesn’t work, and they’ll sometimes just put it down and never use it again. It’s better to keep the vast majority of the users waiting high and dry for a stable release.