Might do. OTOH I often have a shell pipeline as the body of the loop, rely on glob expansion, etc. For ad-hoc parallelism of a simple command over lots of data,

Might do. OTOH I often have a shell pipeline as the body of the loop, rely on glob expansion, etc. For ad-hoc parallelism of a simple command over lots of data, I tend to use xargs -n -P - since I use xargs for other things, I stick with it. Also, bash and xargs are available everywhere, on production servers as well as dev laptops. Anything that requires installing something has a big hurdle to overcome - this counts for fish too.