How is that relevant for the average buyer (as much as these things have an average buyer anyway)? Precision, accuracy, and battery life is helpful info but the inner components are an irrelevant detail. It's not like having a high quality part prevents them from using it wrong anyway.

There's no guarantee that the COOL SMARTHOME SENSOR V1 has the same sensor or MCU like the COOL SMARTHOME SENSOR V1 that I can buy. Sure, it's interesting to know, but it's not too usefuly

Chipset models only form a weak lower bound on crappiness.

You can certainly wreck connectivity with bad and old firmware. Similarly, housing design, PCB thermal isolation, not putting the sensor next to the MCU, measurement averaging settings, etc. all are going to affect accuracy even with the same sensor (particularly dynamic accuracy).

Sometimes Smarthome Scene does do teardowns and checks which chip is used. I guess they didnt' this time due to the number of devices.

I think buyers care more about accuracy and resolution than which sensor. If it’s accurate, with hugh resolution and has good battery life, do you care if it’s Bosch or A Chinese name you’ve not encountered before?

For most of these small sensors you'll need to crack open the device to find out exactly what hardware is really there. More than once I bought at different times apparently identical Zigbee sensors which behaved very differently and it turned out they were different inside despite having the same model name. Probably a hardware revision thing but with no clear markings. Manufacturer couldn't find some component anymore or not for a good price and instead redesigned the device.

Those who care about the internals are techies who maybe want to build their own or are very curious. Most buyers don't care about that, they care about how well it works in practice. Just like they don't care what RAM chips are used in their phone or computer, what modem, what screen panel, what camera sensor, etc.