There are other headsets without metal frame, so we pretty much know this is not necessary. And we also know with certainty that metal absolutely isn't necessary for laptop cases, but Apple still uses metal. The explanation is easy: aesthetics, feel, "haptics".
There are no comparable plastic laptops with similar performance, portability/thiness, battery life, and quietness — metal is rigid, and an excellent heat conductor that contributes to those goals.
Yes, and Apple also sold plastic laptops when they were still on Intel. Apple has repeatedly attempted to sell products with a cheaper chassis (iPhone 5C, Plastic Unibody Macbook) yet their customers preferred metal enclosures.
We don't really know why Apple chose Glass + Aluminum for their headset, but we do know for a fact that:
- 1 Their customers have historically chosen metal and aluminum for their products, and Apple is in the business of building what their consumers prefer.
- 2 Glass and Aluminum conduct heat better than plastic. The 2hr battery suggests thermals are a great consideration where the materials chosen were not just for aesthetics. Perhaps plastic could've worked, but see point #1.
