A fair point. What if the two were rebalanced a smidgeon? Fabricate gets addended to allow create with it and Create Materials let's you create one size category larger per CL? (Perhaps some extra spell point usage in one of these) Akin to how Telekinesis has Powerful TK make it to where you _can_ lift more but be able to do less with it.
It'd give Create Materials the purpose of generating large quantities with Fabricate allowing more detailed work (which it already is intended to do).
I'm more than willing to brainstorm additional expansion on the situation.
It just seems odd to me that the base ability lets you create detailed items from nothing, but the advanced ones put weird restrictions on doing so. This is compounded by the fact that both of the advanced talents require Forge. If both are just advanced subsets of the same basic ability, it doesn't make sense to me for their division.