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It's not orthogonal. Being technical, gives you the necessary knowledge to judge whether a claim that uses technical terminology to argue a business case, actually properly argues that business case or not.

There's an implicit misunderstanding here that engineers making technical arguments, are not making business cases. That is not correct. Good managers know how to interpret engineer arguments in a business context. Bad non-technical managers, will dismiss technical arguments because they aren't able to translate these arguments into a business context.

Sometimes good non-technical managers will nevertheless still do a good job by delegating this judgement based on people they trust. Someone with extra technical knowledge however, would have done an even better job.