This thread makes no sense at all. Stiffer racquets are powerful with comparatively with less weight that is why all lighter beginners racquets are stiff. If u add weight to a racquet and increase it's sw then even If it is flexy it will still be powerful.
Players who play with stiffer frames are those who play with comparatively lighter frames. Eg rodick.
Donay Gold 99 with Tourna Bighitter blue 16g.