If that video of Ricardo Vidort and Myriam Pincen looks rather formal (the music is slow), there's another one I like: I can't embed it because it's not on YouTube, but it's here (the second clip on the page), poor sound but a wonderful dance in a small space. The music and a translation of the poem are here.
I can't help noticing, in both these videos of Vidort and in the video of Harymbat, the way they 'throw' their feet onto the floor, hardly stamping but a kind of emphatic stepping. It's very obvious, perhaps even exaggerated with Harymbat. I gather that this is a characteristic of true 'milonguero' style. I've heard it described as 'adoquin', cobblestones, the way you walk on cobblestones. Whether it matters, whether it makes any difference to the lead or musicality I've no idea, but I'd imagine it emphasises the beat.
Another thing: Vidort uses the entire length of the small space he dances in. We live in a place and time where the ronda is becoming optional. Tango, for more than 50% of the dancers on any floor in London, could well be static, and often is. Tango is said to be a walking dance, but walking movements, or movements that take a couple down the line of dance, aren't taught so often. & tango now takes more space: movements are bigger and less predictable.
Change came from within tango. Here are Todaro and his daughter dancing in the early 50s: they perform all the steps of 'nuevo', but for me the really scary thing is that, like jive or salsa, it all takes place almost entirely on the spot, although the space is about the same as Vidort and Alejandra dance in. Your worst nightmare in a milonga! Change also came from the exchange between tango and contemporary dance: trained dancers like the challenge of a more complex dance and, like many dancers, are fascinated by the possibilities in the synergies between partners, how the movement of one person can suggest a movement to another. So many rich possibilities in the dialogue of tango! It's only really regrettable when dancers ignore the health and safety of those around them: it's usually in the attempt to impress, but the impression of a steel heel can be life-threatening.
The tango of the ronda still predominates in Buenos Aires. Sometimes non-traditional tango is tolerated (until someone gets kicked a lot), sometimes traditional dancers amuse themselves by bunching together to restrict the space available to a non-traditional couple. But in general the two species don't share the same floors, which seems the best solution.