Key to its success is Xiaomi’s LaserLink technology. This is a proprietary optical communication module, apparent as a small dot on the back of the phone and the lens where data is transferred as light (near-infrared laser) at speeds of up to 10 Gbps.
The lens has two pins that connect on the back to draw power from the phone
I think there is a niche this would fit into. But I think it needs to be three things
optional
securely fashioned
high quality
I'm picturing a normal flat back phone that that this attaches to with strong magnets, would appeal to people who want a better camera but not quite spend the money on a dlsr. And if its optional then I'd be able to finally sit my phone flat on the table with or without a fat case again.
I like the idea of it, but I wouldn't trust a camera from Xiaomi. I've got a Xiaomi Mi 10t Lite 5g phone, and the camera is a pain to use. There's about a 50/50 chance of a photo taken using the zoom to have random artifacts over the image. I've had some great photos ruined by it. It happened with my wife's Mi 10t Lite too, so it's not just my phone.
They removed features from the software too. One of the reasons that I chose this phone was because it had a burst mode on the camera, and I had a young child. After the phone was out of warranty, one of the updates removed the burst function. It also resets the settings if you switch apps or lock the screen. I was using the star trails mode last night, and switched to an astrophotography app to check I was pointing the phone the right way, and when I switched back, the camera was back to the default settings. Not great if you want to use one of the other modes.