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Why? That's akin to saying a mechanical engineer isn't worth their salt unless they know how to design and implement software. They're two different specialties that do different things. To be a good mechanical engineer you absolutely don't need to be good at making or even have tried to have make software.

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Cross-discipline experience is invaluable, especially across several domains. One begins to appreciate commonalities, uniquenesses, and the infuriating significance of details only apparent on in-depth experimentation and iteration.

As with usability testing, small-n samples, say three to five, go a long way.

Do you have cross-domain expertise yourself?

That's all true, and almost entirely irrelevant to the (very strong!) claim "a software engineer who hasn't built some mechanism is not worthy of the title".

But why specifically manufacture of consumer goods, when there are so many other disciplines, like horseback riding, nursing, human resources, and so on.

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