@ Piltdown.
The flap for go around was down to slightly different amc for missed approach performance. The guys at Embraer told me it was due to when the engine is considered to fail.
Then because they had the performance data for F2 approach climb they offered it the EASA customers as an option $$$$. Just as the have expanded temperature options and CG options each of which were done to secure a deal with one airline and then offered as an option to others.