Why is the NBA center getting shorter and shorter now?

This is a trend in the development of modern basketball, the traditional center talent is waning, the new inside line of the technology is more abundant, their activities area is no longer limited to the three-second area, so the era of the center's requirements are no longer so much emphasis on height, but a variety of aspects, such as confrontation ability, shooting ability, blocking ability and so on. Modern basketball rhythm is getting faster and faster, the tall center can not help but slow movement, can not keep up with the rhythm, so now the inside are more and more flexible, technology is also more and more delicate. I hope my answer can make you satisfied!