Hmm. Why they are not better known?
First, New World African Traditional Regions (ATRs) are initiation-based traditions with a heavy air of secrecy around them. Getting good information means going to talk with and getting to know people in those traditions, Haitians, Cubans, Brazilians, and others, befriending and talking to them. Not being smug - which is a common a artifact of the magician's ego.
Even well through the 1980s, the inexpensive chap-books of sorcery you could get in New York, Houston, and San Antonio were called 'stupid magic' by Donald Michael Kraig, if I recall, in a Llewellyn magazine. See? Smug.
To make it more complex, then worldview of New World magico-religious cults (said non-pejoratively) is animist spirit magic - a worldview that was almost entirely alien to Anglophone magical practitioners from circa 1870 (and going back to the Enlightenment) up until around the New Millennium or so.
When 20th-century modern magic was being formulated by well-fed British Londoners, they never thought to go talk to them. Wicca is a form of ceremonial magic and kept the 20th -century psychological interpretations. It wasn't until the 1960s that Sybil Leek started giving respect to Vodou and other ATR's, even opening the 'Witch Shop' in Houston. Texas, close to Rice Stadium. And only in the 1980s did Hoodoo and Brujeria started influencing Wicca and 'Wiccanate 'pagan magico-religious practices, and sparked a folk magic revival among white folks.
OK, this is a hard one to get. New World African Traditional Regions (ATRs) traditions do not have a Crowley concept of individualistic True Will (well, kind of) , unless we try expand it in ways beyond what Uncle Al meant by it.
The Vodou concept of Divine Will is not as individualistic as that of the modern magicians. It is better seen as the person's relationship to Bondye (God), the Lwa, and their community. In Vodou, that which is 'good' is often defined by what supports and helps the community, 'evil' being that which harm it, rather than being sliced down to such a fine level of personal granularity as in modern Western Magic-k.
Here your 'destiny' is part of a fabric of relationships, rather than what Steiner would call the 'Luciferian' consciousness of an atomized, opportunistic, calculating individual. One has a
Govi (soul/essence) and a destiny, it is rarely pursued in isolation. The goal is
Konesans (knowledge/balanced living, but also a broad intutition ) within the context of the house (
Sosyete).
In Western Occultism, ancestors are often treated as optional. In African traditions they are more foundational. You cannot achieve your destiny if you are out of alignment with those who gave you life. Destiny is a baton passed down, not a path discovered in a vacuum. Again, the Brujo, who is more sorcerous, will step out of alignment with the community, and become a
malefactor.
A Houngan (priest) or Mambo (priestess) "serves with both hands" (healing and protection), a Bokor is one who "serves with the left hand." They are often labeled as
malfektè because they are willing to perform sorcery for hire outside the moral constraints of a Sosyete (community). I mention this becasue the role of a magican is usually outside the pale of polite socirty. We are dangerous to know.
The post-2001, newer Pagan formulations have attempted to reconnect with their ancestors, but they often view them through a very narrow lens of nationalistic
'Blood and Soil' ideologies. In contrast, the Vodou concept of ancestry is far more open and functional. While bloodline matters, the Ancestors also include the spiritual lineage of the House. It is a living, breathing tradition of adoption and shared spiritual heritage, rather than a rigid, exclusionary racial category. In Vodou, when you are initiated, you are "born" into a new family. You gain the ancestors, and spirits of your Mambo or Houngan. This spiritual kinship is just as "real" as biological kinship. This makes Vodou, while secretive, resilient and expansive rather than clannish, fragile, and overtly hostile to outsiders or other nationalitites.