> the relative verbosity of commands (at least I don't have to go hunting for obscure acronyms, or recursive puns such as yacc, when I read code)

"yacc" is not a command. It's an executable file that's read and executed. In fact, most of the things in a shell script are not commands, but files that are loaded and executed. If someone built a shell with everything built in it'd be a bloated monster full of inconsistencies and incompatibilities.

OTOH, PowerShell has "commands" or aliases named after Unix executables, such as "curl", that don't replicate the switches one would expect from the curl program.

> It's still a bit green on Linux environments, but it already beats many of the alternatives.

Maybe for Windows transplants. In general, not at all.