The simple answer to your final question is, the CFD in robot is just that, a "simple tool" to help assist with your designs. It is not aimed nor should it be used as a final design component (i.e. run wind simulation and be done with it), for such instances you have your own country codes and local guidelines that normally by law should be used, unless actual real testing (real wind tunnels) is being developed, validated and used.
Personally, I use the wind simulation in Robot when trying to understand windward/leeward wind behaviour in complex geometry. Typically geometry that might not be well covered in my local country code. However, even in those cases, Robot wind simulation is just used as a help tool to understand the pressure distributions from a CFD results output perspective. All final design wind forces are still done to local country codes.
