Mulan was a really fun movie but I've realized how subversive and TRASH the message was. 1) In reality, Mulan would have never been able to keep up with the other men no matter how hard she trained. In fact, she would have held them back considerably and would have been a liability. The most athletic girl is still weaker than the least athletic man.
Women dressing as, or even becoming, men, is an ancient trope. In the Mahabharata, Amba, to revenge herself on Bhishma, was reincarnated as Sikhandin--she successfully struck him down because he refused to attack a woman. Mulan is based off 1500 year old Chinese story--there is no trans agenda here.
Have you seen Yentl ?