Would be super cool if they would even port their stuff to Web Assembly. Now we have some Android and some iOS solution, but webasm would be truly platform independent.
I think there is someone working on a webgl version: https://tenso.rs/
Without SIMD I’m guessing the performance wouldn’t be great.
Doesn't JIT automatically SIMDifies some operations on arrays? Although I agree it would be better to have a control over that, instead of hoping JIT compiler would do the right thing.
Generic automatic vectorization remains very much an unsolved problem. Outside of very specific cases, even modern compilers very much suck at it. That's why most vectorizable libraries have hand-coded SSE/NEON assembly blocks. I would not expect a JIT, which has to be fast, to have time to auto-vectorize anything at all, much less to do it well.