Talking with a partner recently who's not danced long, but has a lifelong (literally) love of tango music: 'In one class I was told to hold my hand like this, and in another...' A not unfamiliar story. I reply: if you ask me, classes can be useful, but don't take anything you hear as scripture. What matters is what works on the floor, what's comfortable for you and your partner, what helps you dance together with the music. Hard advice, since if you pay for a class you expect to get The Truth, and it takes a while to realise that what you pay for isn't necessarily any use whatever. It happens. Perhaps the only 'scripture' in tango is that there is no scripture.
The embrace is a particularly complex area since every body is shaped differently, is a different size, has different habits of movement even within a similar pattern of steps.
My right arm has discovered this of its own accord. It's sometimes been blamed for holding a partner too tightly, which is uncomfortable, and I realised that, curiously, the complaints increased with the height of the partner. Shorter partners never had any problems, while a tall (taller than me) partner I danced with found it the most uncomfortable. All the same, other tall partners were perfectly comfortable.
I've also danced with one of the older generation of UK tangueras, one of that fabled generation who found their way to Buenos Aires in the late '80s, a generation with more than two decades of tango under their belts. (There aren't many of them, and they know each other well.) & when I dance with this lady my right arm finds it's completely redundant. I don't need it at all: it simply floats off her back, when we're walking and even when we're turning. True, she's not tall, and she moves very easily, although no longer young. I'm guessing that it's a matter of trust; I know from the embrace that she'll follow effortlessly, and this makes for great dances. So perhaps it's not entirely my fault after all!
I wonder about other dancers' experiences of right arms: your right arm or your partner's right arm. I'm curious about our collective experience of right arms.
PS. When I said that there's no 'scripture' in tango, I was thinking of the embrace, which is going to vary with every partner. I wouldn't want to suggest that everyone is entitled to do as they please on the dance floor! & there is scripture in the form of videos, particularly of the older generation.