Google on Glass Backlash: 'Messy' But Worth It 12 years ago
Anecdotally, the Glass team had a large internal battle about exactly this: half of the team wanted a hardwired LED indicating when it was recording, the other half of the team didn't. Supposedly the debate grew so heated that it fractured the team completely, and the half that lost mostly transferred onto other Google X projects, like Loon.