Certainly. The most important thing in the first stage of any business is selling (a.k.a. getting customers or users) and figuring out the most effective way to do so. Not design, not logos, not getting funding, not adding features, and not even refining and perfecting what you already have. There's no point in polishing a turd or putting it in a fancy suit if you can't figure out how to get any traction for the basic version.
I'm always more impressed by the companies that show a list of customers before they launch, then the companies assuming they need to launch to get customers (or that launching will necessarily lead to additional customers).
"Noteleaf is great, but it can’t tell you why you’re meeting somebody or whether it’s a poor use of your time."
This is somewhat orthogonal to the meaning of the conclusion, but maybe they could track that somehow. Add some kind of "why" description when you create a meeting and then afterwards allow you to rate it on usefulness?
Perhaps, but one thing we've found as a rule is that people don't want to do work in order to gain something. Only a small percentage of would likely want to write something in a why description and rate it thereafter.
Now if there was something to be gained by the user, like a shot of happiness, bragging rights, increase social capital, then they'd be willing to rate their meetings.
But for the time being, we don't have anything that would be compelling enough for people to do that.