To add a bit of context: I'm not even romanticizing the actual implementations, which may or may not have had horrible bugs and errata. Rather, it's the abstrac

To add a bit of context: I'm not even romanticizing the actual implementations, which may or may not have had horrible bugs and errata. Rather, it's the abstract concept, the ability to have a reasonable expectation that, for example, the firmware would be completely operable, scriptable and so on and so forth from a serial line. Stuff like this.