 There is certainly room for development if we go down route (1). The intuitions that provide evidence for Identity are, like intuitions generally, considered by many philosophers to be relatively weak sources of evidence, because there may be all variety of psychological, historical and sociological forces responsible for our holding this or that view to be intuitive which have little to do with whether the view is true or credible. There’s also a tradition of conceiving states or facts as capable of being analysed into more than one collection of constituents, i.e., a tradition that denies Uniqueness (Frege 1884: §64; Hodes 1982; see Macbride 2007: 54–55 and Liebesman 2014 for counterarguments to Fine’s assumption; but see Leo 2013 for a view which denies uniqueness for states).