In my venue majority of members of those "performance teams" indeed dance socially. And of course, they have drills, work on fundamentals etc (again, quality of this depends on the teacher). But ... it's still different. In performance dancing, point is on "external". So it's mostly how it looks - precision of movements, speed, energy, exaggerating things, in short everything that will make some impression to the guy in the last row (or adjudicator on the other side of the floor if it's about competition), while there usually isn't that much point on how it feels to the partner. While these are nice-to-have qualities for any dancer, social dancing has slightly different priorities
There was a girl in my venue I have been enjoying dancing with since she was a beginner (without significant previous dancing knowledge). She had really nice and fluid body movement and was very musical. And she also liked dancing with me. Eventually she joined local performance group and gained much energy, speed, precision, variety etc. I liked that, it felt similar to what I was used to dancing as b/room competitor and later with ex competitors. But, somehow, I started getting an impression that something is missing - our social dancing became too technically oriented and lacking "soul" / "sabor" / "whatever", and also, I didn't like her body movement anymore, as it became somehow unnatural. So it wasn't that fun anymore (although she didn't change her attitude like most other "performers", at least not in relation with me). But after about a year, she quit with that group and our dancing gradually became more to my liking again, so now it's better than ever.
There was a girl in my venue I have been enjoying dancing with since she was a beginner (without significant previous dancing knowledge). She had really nice and fluid body movement and was very musical. And she also liked dancing with me. Eventually she joined local performance group and gained much energy, speed, precision, variety etc. I liked that, it felt similar to what I was used to dancing as b/room competitor and later with ex competitors. But, somehow, I started getting an impression that something is missing - our social dancing became too technically oriented and lacking "soul" / "sabor" / "whatever", and also, I didn't like her body movement anymore, as it became somehow unnatural. So it wasn't that fun anymore (although she didn't change her attitude like most other "performers", at least not in relation with me). But after about a year, she quit with that group and our dancing gradually became more to my liking again, so now it's better than ever.
then merengue
. ... then Repeat; all night long