Mature tech evolves more slowly. Think about cars, there's nothing new about them any more. But wait, what about electic cars? Aren't they a new thing? And driverless cars. And soon flying taxis. Automobiles are an old invention but they are still evolving.
The reason the evolution of cars has slowed down so much is mostly regulatory compliance.
With the current ongoing revolution in home manufacturing (starting with 3D printing; currently there is a lot of work done in home CNC machining), it would be easily possible to get a huge leap towards "print your own car".
The reason why you see nothing of this is basically red tape.