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IIRC all Commodore machines did this. The C64 did. That's how you edited a program: you LIST'ed it, and then scrolled up and changed the lines on the screen. When you hit ENTER the new line overwrote the original one.

The C64 did not have any way to directly show or edit system memory, though. That's cool.

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The C64 was indeed one of the only Commodore machines that did not ship with a Machine Language Monitor. You could however install one: https://www.c64-wiki.com/wiki/Machine_Code_Monitor

Sure. I even wrote my own, as an exercise in learning 6510 assembly.

Are you forgetting about POKE and PEEK?

No. But an actual monitor was a much easier way to directly access system memory.

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