for no purpose other than to make the plot bend to his will

as deadsy said a full strength suian would make more of a claim for amyrlin seat, which means that egwene would not be amyrlin seat, but suian still gets a return to becoming aes sedai

RJ might have said males must Heal females and vice versa, but how does that makes sense? it just felt as i was reading it that RJ did it for the reasons above rather than keeping her stilled, which still made her an effective and interesting character, but he wanted he wanted her made AS again