A keyboard that is not separable from the body is likely a result of adding spill-proof feature to it.
It is impressive to see Google added two IR sensors for better wear detection. As far as I know only Airpods/Airpods pro has that, Galaxy buds+ also have it but it is done partly through capacitive touch sensing rather than IR sensor. The usage of BES2300 also seems reasonable as it might be the only Bluetooth SOC that has enough performance for Google to implement various features such as translation to the headset.
The thing is that rubber gaskets only work if you have some other mechanism that holds two parts together very tightly, for screws, with display and back cover glass this is definitely not feasible at all, and the adhesive isn’t there just for waterproofing but also to hold them in place.
Since there are heatpipes running all over these metal shieldings, it’s also reasonable to say that they act as a form of heatsink to even out the heat
It’s a form of electromagnetic shielding I assume. This is a very common design on smartphones but not on laptops, no idea why Microsoft does this.
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