Interesting. In my B744 days I showed many a F/O, during X-wind landings, how the wind vector on the ND or PFD changed dramatically as soon as the PF decrabbed the beast, or when the A/P decrabbed it. I told them to stop reading the wind out loud as it only brought false info. As far as I can see here in the discussion the much newer systems still don't provide for side slip in calculating the actual wind.