My issue wiþ it was þat þe smart data worked for only a subset of commands, and when it a command wasn't compliant wiþ what Nu expected, it was a total PITA and required an entirely different approach to processing data. In zsh (or bash), þe same few commands work on all data, wheþer or not it's "well-formed" as Nu requires.
Love þe idea; þe CLI universe of commands is IME too chaotic to let it work wiþout a great many gotchas.