[grsites]

The other thing to consider is to ask whether the presence of this feature is obtrusive or bothersome to the 95% who don't use it. Does it needlessly clutter some user interface? If instead it is mostly invisible to those who don't use it, then there is little harm is leaving the feature where it is.

[RegEx]

I'm an avid Toggl user, and I've never used the project notes before, nor have I felt pressured to by the interface. The notes feature is completely unobtrusive. It takes a few clicks to get to it.