Java's Panama Vectors are work in progress and are far from being competitive with .NET's implementation of SIMD abstractions, which is mostly on par with Zig, Swift and Mojo.

You can usually port existing SIMD algorithms from C/C++/Rust to C# with few changes retaining the same performance, and it's practically impossible to do so in Java.

I feel like C veterans often don't realize how unnecessarily ceremonious platform-specific SIMD code is given the progress in portable abstractions. Unless you need an exotic instruction that does not translate across architectures and/or common patterns nicely, there is little reason to have a bespoke platform-specific path.