The Beziere Mask I do still think it needs to have its own motion tracker. I'm talking from a color grading point of view. Maybe what VEGAS team can do for the Beziere Mask is to make it only motion track the mask position. Let the new dedicated motion tracking panel do the Data Transfering. VP17 color grading workflow is so good, I can add a bezier mask from the grading panel, do masking & motion track, all directly there in one FX.
In VP18 I need to get through the New Motion Tracker first, then send the data to Beziere Mask, & back to the grading panel. Trust me, this will reduce all of the hassles for colorists if the Beziere Mask remain the same as it use to be.