At the moment when you change the intensity during a workout the graph changes up/down and the interval stats shown after the workout are also changed ie if the interval target is 220watts and you increase the intensity by 3% then the target shown in the stats will be 226 watts and not 220. I would much prefer it if both the graph and the stats stay at the planned target rather than change. This will mean looking back you can easily see if you were above/below the planned intensity.
An added benefit would be that those who have issues with powermatch could turn it off and simply adjust the intensity of the workout to match the target.