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I'd rather have a good API late than a bad API early in a language as committed to backward compatibility as Java.

Well, being a portable platform is hard.

Even for native platform like C/C++ or Rust, SIMD intrinsic took a while to develop, and required multiple iterations to mature for each supported platform. Plus, with newer CPU instructions being introduced, the job is never fully done.

> Yet the ability to do SIMD in the JVM is on its sixth incubation.

As noted in the JEP. The Vector API cannot be move to preview before value classes are available. Hence it is still in incubation and will be for quite some time.

That's because they want to get it right. The same with Valhalla. The same with Loom.

another important feature is Arena api which is also in preview state