Comment 12 for bug 965080

A tooltip is harder to see than always-visible UI text. Therefore, a tooltip should be used only when there isn’t enough space to convey the information otherwise. That’s why System Settings hardly ever uses tooltips: because there *is* enough space to convey the needed information without them.

Even if that wasn’t true, the fact that System Settings hardly ever uses tooltips means that for any particular element in System Settings, people would not expect it to have a tooltip. If people aren’t expecting it to exist, they won’t put in the effort to reveal it, so it isn’t an effective way of conveying information.

Anyway, I’m now responsible for the design of System Settings, so I finally get to fix this.