And you could make the same case for other inventions.
Hammers in 1860 looked like hammers. In 1880? Same thing. In 1900? Same old hammers. 1920? 2020? Yep you guessed it, still a hammer.
Some things are invented and then perfected to a point where you can't really improve them much in a cost effective way. That doesn't mean that new stuff isn't being discovered and worked on at the same or faster rate.
Hammers in 1860 looked like hammers. In 1880? Same thing. In 1900? Same old hammers. 1920? 2020? Yep you guessed it, still a hammer.
Some things are invented and then perfected to a point where you can't really improve them much in a cost effective way. That doesn't mean that new stuff isn't being discovered and worked on at the same or faster rate.