An API would be great, I won’t buy any products where I don’t have access to my own data in a convenient and automated fashion. I made that mistake with Ring and Nest and won’t make it again, no matter how “convenient” the product may appear to be. Separately from that, I really just want the hardware. No cloud services of any kind.
If I can disable the cloud integration, apps, etc. and just send the raw data to my MQTT server, I’m a happy camper: instant buy.