I haven’t switched to ysh. I personally use Zsh for my interactive shell, but I write my scripts in a variety of shells.

You can start with Ysh in its Bash-compatible mode, individually enable new features with shopt. Those features include:

• Not splitting or globbing $foo by default (this is shared by Zsh and Fish)
• A Python-inpsired parsing mode, which should supersede arithmetic mode (induced by ( ) in tests, $[ ] for string splicing and @[ ] for array splicing)
• Strucutred data
• New functions which return structured data (Oil calls classic shell functions “procs”, because they behave a lot like external programs with extra side effects)
• cd to/somewhere { echo $PWD;}