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Thanks for the correction. I was definitely out of date, what I said was only true during the USB 3 era.
So this is an optional part of the USB 4 spec, but from what I can tell this is required for PCs shipping with Windows 11 and USB 4 ports. Yes, this seems like more manufactured confusion courtesy of USB IF.
Exactly this. When you procure custom hardware, you’re paying (a lot) for the vendor to ensure that each unit meets the specifications you provide. If you validate off the shelf hardware like this, there is no guarantee that another batch of the same sku will also meet your requirements. Imagine training on these controllers then a certain batch of them has wildly different sensitivity.