I think this is only a miscommunication issue. ECS and jitterbug are often used as generic terms encompassing all swing dancing, so when someone recommends WCS or lindy, in their mind, it's not out of bounds. The dances are often mixed too. You don't do just one on the dance floor. You'll often do a lindy swing out followed by perhaps an ECS basic, then maybe a boogie woogie move and top it off with a bal spin and a close blues connection into a dip.