Rules vs. Style
What are the rules of lindy hop? For a dance over 90 years old, one might surmise that some agreed upon standards have been put in place.
Fortunately, lindy hop has avoided having any kind of governing body or book standardizing the dance. The spirit of lindy hop celebrates individual style. To take that away would lose that essential element of what makes lindy hop so special. There are so many dancers that have a style I appreciate. While I certainly have my own opinions and preferences, I would never hope for everyone to dance exactly the same.
That said, I would argue that the timing within lindy hop is generally agreed upon. The music happens and the dancers respond. That’s what makes the movement swing. This compared to the music and the dance happening simultaneously.