As someone who studied music and instruments from the age of 3-18, there is music theory and music trainings, yes there are natural talents but it’s something you can learn, it doesn’t matter how good you are naturally most people, if they have ever studied enough should be able to get at least a pass in a theoretical exam, which mean they will be able to identify pitch, count the beats at least from 1-8 in a song etc, even some school exams will test this doesn’t need to be professional extracurricular ones. Becoming talented musicians, on the other hand is a completely different subject. “Starting from 0” means people with 0 music background, they will have to start to learn at least counting the beat first, from scratch. Even for me with music trainings in my belt, salsa music are not easy to count! So I can imagine how hard it is for someone who don’t have any trainings, then natural talent will have to come into play. And of course being able to understand music is only part of the game in dancing, but people with existing music trainings are at least half way there in the counting
I am one of those people who started from 0 for both music and dance late in adulthood. While prior music training can give certain advantage starting out, it only helps so much when it comes to dancing. That is because dancing and music are very different skills sets.
Counting honestly doesn’t help a lot with dancing. May be it helps musicians in training and playing music. I see a lot of detrimental effects of counting when dancing. If you are sitting down and practicing counting to the music you dance to, that is different. Trying to count while dancing is not something I would advise anyone. You got to reach a place where you semi-intuitively know which beat you are on when dancing without having to count.
Even if you are counting correctly, it doesn’t mean you are indeed stepping on the beat. That also requires training and practice. Beyond that is ability to play with the music or the beat. This is where you mean deliberately step before the best, on the beat, or after the beat. That depends on the music and how you are trying to interpret it.