We have had that for 15+ years even in C with fine grained looping like OpenMP. It’s terribly inefficient to communicate across threads. Sometimes you just need SIMD

I support that effort. In the meantime, we have to do what we have to do. I'm presently in the process of optimizing some stuff and comparing the improvements of SIMD vs GPU on both ARM and x86 (this isn't that impressive, it's some basic loop vectorization). But just as Linus writes in that post, getting the compiler to do well seems impossible.

I'm measuring performance improvement and energy consumption reduction. The results are incredible. We really have to do this stuff. But it's complicated and the documentation is generally awful. So yes, a new language that deals with all of this would be very, very welcome :)

Star Lisp!

Although any functional or HPC language like Chapel will do.

... like intel ISPC.

Spoiler alert: it is a C dialect.

This won't help, most uses of AVX or NEON have nothing to do with parallel processing of a bunch of numbers

How will these languages emit machine code for every variant of GPU/CPU/DSP/Vector/FPGA/whatever architecture they might run on? This isn't as simple as it sounds.