I agree with this but some people say closed embrace is the real tango, some people say nobody dances in open embrace in milongas etc. On the other hand, all beginner classes in the festival (sultans of istanbul) was in closed embrace. I didnt have many option.
Close embrace is like walking on ice, and open is like running on the tarmac.
i.e. there is no room to mistake in close embrace.
You have your own way for tango just as everybody do.
Be curious but not frustrated.