It helps to know what you're dancing to in the music. Where the beats fall, syncopation, melodic phrasing. It all adds up.
Here's the trouble with lessons where that is concerned: I have taken a lot of them. A lot. Some with people who are very well-known and who earn their living teaching mostly that. I will not name names because I don't want to do any harm, but you can probably guess a few . . . if they come to Montréal, they surely come to NYC.
In all of these lessons, they just assume that people know what beat, rhythm, and melody are. What a time signature is. What strong and weak counts are. What phrases are. They speak the language of music theory, not dance for people who've never had a music class in their life.
Me, I was forced to learn that stuff at school. Due to the era when I went to school, the school I went to, and several other factors, it was taught. I didn't particularly have a gift for it, but I remember the terminology.
Most people are just as clueless at the end of musicality seminars as they were at the start. That is because the terminology simply isn't necessary for dancers. They can be musical intuitively without ever knowing what it is they're dancing on in formal terms.
What these people need isn't musicality as it's taught, but something closer to "Do what you like, but make sure it fits something in the tune." As it happens, one teacher I had did that. People got it. I think that's what might be missing.