I think a good parallel language will be the one that takes your code written with tasks and channels, understands its logic, rewrites and compiles it in the most efficient way. I don't feel that I have to write something harder than that as a pity human.

mapping from channels to SIMD seems kind of intractable, its a kind of lifting that involves looking across the producers and the consumers.

going the other direction, making channel runtimes run SIMD, is trivial