No toy will ever be The Final Ever. Tech, materials, engineering and budgets can always change. At best a toy can be "the most accurate yet". Even G1 Optimus Prime has gotten 3 Masterpieces, and I bet you that a Convoy 4.0 will happen before 2030. Ultimately, you were never going to get perfection at $20USD. And hey, PF is NOT $20, so it's not supplanting SS's place.