In actual engineering, one can work out the theoretical limits (strength, expansion, etc) and measure the current product's performance against the limits. A new widget-making machine or process cannot imbue widgets with physics-defying properties. Any fundamental improvements can only be made on the outside, auch as new alloys; but that would be an entirely different product, nor the one you've been selling for 40 years that your customers trust and love.
In actual engineering, one can work out the theoretical limits (strength, expansion, etc) and measure the current product's performance against the limits. A new widget-making machine or process cannot imbue widgets with physics-defying properties. Any fundamental improvements can only be made on the outside, auch as new alloys; but that would be an entirely different product, nor the one you've been selling for 40 years that your customers trust and love.