Embellishments are like Dchester said (and another word for them might be adornments) to me adornments are to be used in moderation. I equate them to women dressing up to go out for the evening. Some women know just how much to accessorize not too much jewelry not too much make up and you look beautiful and sophisticated however get carried away and over accessorize and you’ve ruined the whole look.
When you tango the same rule applies be very selfish with the adornments and you will look beautiful and expert in your dance however get carried away and over do it and you join the ranks of those who are clueless.
Interpretation to me is how the man chooses to lead.
Small embellishments are perfectly appropriate for a social floor--small circles on the floor drawn while pausing, a quick cross behind or in front of the other foot, rhythmic taps. Those are all embellishments, all small movements, and all fine for social dancing.
It's not focusing on the feet to the exclusion of feeling the music. It's feeling the music throughout your whole body, right down to the tips of your toes. It's feeling the music and being moved to express it, even in stillness. It's (often) the woman taking some of the responsibility for musical expression, independent of the (usually) man, and finding ways to add her own voice to things.