That article has a cool evolving history of dishwasher design. And I'd be surprised if things weren't less diverse in the market, honestly. One important thing I would add is that Bosch is one of the most popular dishwasher manufacturers worldwide and their products are offered under multiple brandings. This and the fact that they all effectively function the same easily corroborates your findings, without making anything generic about it.

All I can tell you is at the end of the day, your Siemens is literally a Bosch manufactured unit.