Right, you added a bunch of interesting details (thanks!) to your post after I glibly replied but I'm still not entirely convinced the SuperFX carts really count. It's a bit like saying your Apple ][ was just like a Mac because you could shove a 68020 card into it.
The SNES was a 3.5 MHz 16 bitter. The n64 was a 3d-capable machine with a 100ish MHz R4k, the RCP, an analog controller, etc, in the box. The advance just seems enormous (matching similar advances in personal computers in the same timeframe). If I'm understanding you right, you're making a case the advance was maybe not as discontinuous. But the scale of it still seems qualitatively greater than any of the subsequent ones, to me.
The SNES was a 3.5 MHz 16 bitter. The n64 was a 3d-capable machine with a 100ish MHz R4k, the RCP, an analog controller, etc, in the box. The advance just seems enormous (matching similar advances in personal computers in the same timeframe). If I'm understanding you right, you're making a case the advance was maybe not as discontinuous. But the scale of it still seems qualitatively greater than any of the subsequent ones, to me.