Why would Google/Nest sell a thermostat which cannot have any compatible temperature sensor

[Parag2906]

It's very clear from below link that Google Nest Thermostat can niether be added to Nest app not it's compatible with Nest temperature sensor.

I am writing this post to if anyone can suggest me a temperature sensor which is compatible with this Google Nest thermostat.

If not, I feel this is utter nonsense that you sell a products with "Nest" name under it which has nothing to do with Nest themostats other than it's round design.

It's waste of time and money both.

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Having-a-problem-installing-Nest-Temperature...

[Jake]

Hey there,

I wanted to follow up and see if I could be of any help. I found an article with more details on the Nest Temperature Sensor. Please let me know if you have any questions from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Best regards,
Jake

[Parag2906]

Hi Jake, I bought this NEST thermostat which only works with Google home and not NEST app.

That's not a major issue. But now I purchased a NEST temperature sensor which wont pair with either NEST app or Google home app because NEST thermostat is not on NEST app.

?Can you help either with 
1) Help me get the NEST temperature sensor.
2) Any way to Upgrade my thermostat without me taking a monetary loss on existing NEST thermostat.