My personal opinion aligns with YC actually.

It's specifically in the handling of a Thunderbolt device not just any
USB device. If a thunderbolt device is automatically authenticated it
does improve the usability at the expense of security.

A nefarious Thunderbolt device can trivially perform a DMA attack if
automatically authorized in a situation that DMA mitigation such as
IOMMU (VT-d) is not used.

Until there is a guarantee of DMA mitigation presence (which is going to be 
coming in 4.21 and a newer version of bolt) it's much safer to adjust 
 to prompt for authorization or open a notification to do such.

I feel if this change is included Canonical's security team should
review as well.

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https://bugs.launchpad.net/bugs/1800715

Title:
  Prompt for credential when it shouldn't

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