First reference I’ve seen to the aluminum used - longtime tech guy L0veToDream on X is not a fan of the material
“First impression when opening the machine is it feels cheap Why do I say that First off the sandblasting grit on this machine's aluminum alloy surface is super coarse nowhere near the texture of a MacBook Air/Pro or other aluminum Apple products The main reason the surface treatment sucks is probably to cut costs save on labor time boost efficiency and the result is you can still see that CNC or forged brushing feel on the aluminum surface 😂 Don't believe me go check it out in-store the texture is really poor and it feels rough to the touch”
Source (translation used)