In learning traditional tango we want to distinguish between what is essential and what is inessential. When we look at dancers of tango we see many things which are aspects of individual expression or which are purely decorative. Most of these aspects are not essential to tango because you can dance tango well without them. If you see some tango dancer having a certain facial expression or some other affectation, or doing some decorations with her feet, does that mean that you cannot dance tango well without that? The reality is that most of what stands out to an onlooker who has little understanding of tango are its inessential aspects.
Experienced tango dancers focus first and foremost on connection: the connection between the partners through the embrace; the connection of their dancing to the music; and the connection of their dancing to the energy of the dancefloor. The key to connection is a good embrace and good leading and following. The dancing should express the music by marking the beat and pausing. Finally, the dancing should connect to the energy of the other dancers on the dancefloor and should not stand out as radically different from what everyone else is doing.
If the dancers do not have some particular expression on their face or some other affectation, this does not mean that they are not doing good tango. But if they don’t have a good embrace, are not connected in their leading and following, are not connected to the music, and their dancing stands out as out of sync with the dancing of the other dancers, then there is something fundamentally wrong going on and we cannot say that it is good tango. Our goal is to have a better embrace, better connection to our partner, the music and the energy of the dancefloor. These are the essential skills. The other aspects are mere affectations and are superfluous and thus best avoided until we have more experience in the essential things.