What the Hell do Producers do? Who knows...

The factual TV sector has many entrepreneurial producers but there are very few creative producers in the UK and further afield who produce feature length docs with worldwide ambitions. Lots of filmmakers produce their own work - is this through choice or because they can't find someone to collaborate with? Is it due to a skills gap or a lack of interest in becoming a producer? Is there a lack of knowledge about what producers actually do (apart from trying to raise money!) and how people might get training and mentorship to learn.