I'm interested to know how and in what ways the REPL experience in Xerox PARC and ETHZ workstations were enjoyable...Can you elaborate please or share some link

I'm interested to know how and in what ways the REPL experience in Xerox PARC and ETHZ workstations were enjoyable...Can you elaborate please or share some links? I know that there is Nushell (1) that tries to re-do the concept of shell with ideas taken from Powershell. [1]: https://github.com/nushell/nushell https://github.com/nushell/nushell