Task concurrency is probably not a great idea for heavy numeric work anyways, right? I’m scratching my head a bit about what the use case for this is in Julia given that there are much better ways of doing parallelism already.

Which ways are those?

Data parallelism mostly.

We're not talking about concurrency, but actual parallelism.

Anyway, if by data parallelism you mean simd, then that is already available and widely used in Julia. Multithreading comes on top of that.