That is the issue. Not only is it essentially a magic mix made of meat, but it's also extraordinarily (and irreducibly) expensive compared to every other compo

That is the issue. Not only is it essentially a magic mix made of meat, but it's also extraordinarily (and irreducibly) expensive compared to every other component/process. Whoever fixes the 'FBS Problem' will do well - but until then, these unfortunately seem to be fancy, expensive experiments.