Underfire,
09/27 parallels will certain present some challenges. The biggest one in my opinion being how traffic from the Southern parallel interacts with YMEN traffic. Procedures will be developed to manage this but it remains to be seen how efficiently this runway can be used with YMEN operating simultaneously.
In terms of the wind issues. Having to go to Rwy 16 only is more commonly caused by too much tailwind on Rwy 27 rather than too much crosswind. With the parallels built and procedures in place, Rwy 09 left and right will be used almost as much as Rwy 27 left and right negating the issue of tailwind on Rwy 27.
On the odd occasion that there is a greater than 20 kt southerly, then yes we'll have to go to Rwy 16 only, which will be a pain if traffic levels have increased in line with what the parallels allow, and the more common occurrence of a greater than 20kt northerly will cause similar pain.
Modelling of taxiway movements have shown that building a 16/34 parallel instead has less gains for efficiency due to extra crossing required of the other parallel on the way to or from the western runway.
Ideally, the terminal would be in the middle with runways surrounding it, but the way it is, that's basically impossible and gives us the compromise options.