What makes "FOCAL" FOCAL?

[Orome]

What exactly distinguishes 41 programming features so much from previous models that it warranted its own (unofficial) name as a distinct language?

Many of the differences are just quantitative incremental ones: more registers, flags, tests; and multiple index and looping registers. Alphanumeric representation of programming steps (vs. key codes) isn’t really, strictly speaking, a language change. And even the ability to program many more operations than can be represented on the keyboard (as Alphanumeric labels) is arguably not a programming feature as such, but a feature of the functionality being programmed.

Is it just the difference between the “keystep programming” of previous models and more general “RPN programming”, freed from the constraint that each operation must correspond to a key?