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This 9v battery contained six cells stacked like a layer cake
(lemmy.sdf.org)
Picture of a disassembled Duracell 9v battery. Below the terminal assembly is a clear plastic case where you can see six sets of stacked rectangular terminals and fillings.
I hope so. I don't know if it would work to make a smartphone in a clear plastic case like that phone, but if someone did it, people would probably just complain because it was plastic and not metal or something.
IIRC there's a transparent version of the Fairphone 5. Not that it's as aesthetically interesting inside as older tech, more of a statement about the device's modular design.
I just looked it up. It's a little too opaque for my tastes based on what I'm talking about but you're right, it's not as interesting inside. Maybe that's why other companies stopped doing it. It still makes sense if you want to show off the design of the device in a specific way like you said.
I can't remember who did it, but there's a YouTuber who always clearifies his phones when he gets a new one by removing the back and putting a gorilla glass back on it. Haven't seen his videos in a while, I don't think, but he has several iirc.
I think "Phone Repair Guru" (or something like that) does it similarly.