A clarification re Adobe Multiple Masters font technology. This predated
OpenType, and such fonts are no longer offered and are discontinued. I
omitted to mention that OpenType does not support the parameterization
concept of MM, and so OT is not an evolution of MM. This is generally
because MM was seen by typographers as not being excellent in terms of
the art of type design, with all sorts of distorted faces being
possible. It's related to the way in which type designers cut italics
specially, and do not simply slant roman faces to make oblique forms. I
think that's the main reason why it died out.