The thing is that emacs predates Apple developing cmd-z/x/c/v and Microsoft copying Apple in Windows. Before that, the most commonly copied keystrokes in programmer's editors were the freaking Wordstar ones e.g. in all the Borland products.
Also OP apparently has no knowledge of the far better IDEs we had 30-40 years ago including but not limited to:
- Apple MPW, 1986. GUI editor where every window is (potentially) a Unix-like shell, running commands if you hit Enter (or cmd-Return) instead of Return. Also the shell scripting has commands for manipulating windows, running editing actions inside them etc. Kind of like elisp but with shell syntax. There's an integrated source code management system called Projector. If you type a command name, with or without arguments and switches, and then hit option-Return then it pops up a "Commando" window with a GUI with checkboxes and menus etc for all options for that command, with anything you'd already typed already filled out. It was easy to set up Commando for your own programs too.
- Apple Dylan, 1992-1995. Incredible Lisp/Smalltalk-like IDE for Apple's Dylan language
- THINK Pascal and C, 1986. The Pascal version was orginaly an interpreter, I think written for Apple, but then became a lightning-fast compiler, similar to Borland on CP/M and MS-DOS but better (and GUI). The C IDE later became a Symantec product.
- Metrowerks Codewarrior, 1993. Ex THINK/Symantec people starting a Mac IDE from scratch, incorporating first Metrowerks' M68000 compilers for the Amiga, then a new PowerPC back end. Great IDE, great compilers -- the first anywhere to compile Stepanov's STL with zero overhead -- and with a groundbreaking application framework called PowerPlant that heavily leaned on new C++ features. It was THE PowerPC development environment, especially after Symantec's buggy PoS version 6.
- Macintosh Allegro Common Lisp (later dropped the "Allegro"), 1987. A great Mac IDE. A great Lisp compiler and environment. Combined in one place. It was expensive but allowed amazing productivity in custom native Mac application development, far ahead of the Pascal / C / C++ environments. Absolutely perfect for consultants.
Really, it is absolutely incredible how slick and sophisticated a lot of these were, developed on 8 MHz to 33 or 40 MHz M68000s with from 2-4 MB RAM up to maybe 16-32 MB. (A lot of the Mac II line (and SE/30) theoretically supported 128 MB RAM, but no one could afford that much even once big enough SIMs were were available.)