In my opinion the meter causes a lot of confusion.
First of all, the default setting (at least on controller based swings) is for an outside/in swing to produce a draw and an inside/out to produce a fade. You have to CHANGE the setting to "inverted" in order to get the anticipated results.
Secondly... once you DO change that, an outside/in swing will actually show a path of inside/out but the ball will actually fade. So the meter is actually showing the direction that the ball will travel, not the path of the clubhead/swing.
I have turned the meter off for multiple reasons, but this is one of them.