I agree, emotions are detected in a probability range. The software tells us the likelihood of a face expressing a certain emotion.

Regarding the reliability of emotion detection through facial recognition software there's an interesting paper reviewing 8 commercially available software:

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231968

And then another one comparing manual vs automatic analysis: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0223905

There's much work to be done to establish this technology as the gold standard. Only time will tell.

I've sent you a LinkedIn request. Thanks for taking the time to read and comment, Debesh!