Earlier quoted context omitted.
Decades of optimizing a toaster to make better toast will not make the toaster any better at making meatloaf
Is this the right analogy? The product is the same, the appliance is different. It should be "Decades of inventions from toasters to IOT AI Smart Air Fryers will not make better toast than the original" But I'd argue the IOT AI Smart Air Fryer should make really good toast. Which is what GP is saying.
Both a toaster and an oven might benefit from improved electronics but in the end—whether its a toaster from the 60s or a toaster from 3008—you are still using a toaster to make a meatloaf.
CSS is not remotely comparable to a game engine. It's not even a programming language.