I think it's hard to know where to draw the line between derivative product and something unique. If we follow your logic that TSMC hasn't done anything new, then aren't all computer manufacturers just rehashing the ENIAC or whatever? Is a Tesla just a better model T? No, arguably we would say that these products are new to market because they've integrated new technologies in unique ways and often expended massive capital on R&D to do so. TSMC is no different.

They took extreme risks on EUV lithography and accumulated market share by being the first to shrink nodes.