And also for the new A320 and the SR22T.
The SR22T has both CFD and modern prop features enabled as well, as do I believe the KA350 (at least modern prop).
The major resource problem with enabling the CFD and/or modern prop is you have to effectively start your flight model over, and tune all again from the ground up. Modern prop, though capable of much more accuracy, is in particular time consuming, because it is parametric and not tabular, requires testing the entire flight regime for every single tweak. I personally spent two and a half weeks in the SR22T prop alone.
Multiply those by every aircraft in the fleet and you could easily spec a person’s entire job for 6 months or more. It’s no small potatoes.
The reduction of winds at surface level is a legacy behavior. It can be disabled or tuned by using the flight_model.cfg parameters ground_crosswind_effect_zero_speed and ground_crosswind_effect_max_speed. These parameters and how they work are explained in depth in the SDK documentation.