Why my “Find steed” warhorse still cannot attack while mounted ?

@TadenRifso my “find steed” warhorse still cannot attack while mounted ? what is the purpose of a *WAR*horse then, even a regular one ? historically, warhorses don't fight. They're trained to operate on a battlefield without panicking or resisting a rider's orders

— Mike Mearls (@mikemearls) May 19, 2016