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Why yet another proprietary space electronics communication bus? Do we still not have a standard, useful, open space electronics communication bus? Can someone explain to me why not?

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Not that kind of bus. A “satellite bus” is more of a standardized platform onto which mission-specific payloads are integrated. Saves having to design an entire spacecraft from scratch and gives you a known-good set of functionality.

So, a set of standard software RPCs (remote procedure calls) and APIs (application programming interfaces) and not another electrical signalling standard. Got it.

Thanks for the correction.

So, I guess the next question is what are you folks actually using at the electrical signalling level to talk? (If you are not allowed to say, I understand.)

No, not RPCs/APIs either. A satellite bus is a physical object[1], which defines the mechanical standards for mounting payload modules.

[1]: https://en.wikipedia.org/wiki/Satellite_bus

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