[patrickmcnamara]

This is probably due to the fact that fish isn't 100% POSIX compliant. A lot of commands new users see on the web won't work properly in fish shell.

For example, you couldn't set environment variables for one command in fish like you could in other shells until the last minor version (3.1).

I'm glad fish is becoming more like other more standard shells while maintaining its user-friendliness.