RISC-V Vector Instructions vs ARM and x86 SIMD

Is old Cray-1 style vector machines coming back? What exactly is the difference between vector instructions and modern SIMD instructions?

In the 1980s, super-computers looked like what you see in the image below. The semi-circular shape of a Cray was synonymous with super computers in the 80s. That was just what a super computer looked like.