But we don't know that we can't ever possibly test consciousness, we just don't know how to test it yet.
Before Archimedes, the problem of determining the purity of a golden crown was intractable. Archimedes' solution was not arrived at by brute force concentrating on the problem, but rather by an epiphany (leading to the famous story of him shouting "Eureka" and running out of the house naked). https://en.wikipedia.org/wiki/Eureka_(word)#Archimedes
It's possible that someday someone like Archimedes will realize a way to test consciousness, and it'll be something ridiculously simple (like Archimedes' submerging the crown in water and seeing how much water it displaces), and we'll all kick ourselves for not thinking of it first :)
Before Archimedes, the problem of determining the purity of a golden crown was intractable. Archimedes' solution was not arrived at by brute force concentrating on the problem, but rather by an epiphany (leading to the famous story of him shouting "Eureka" and running out of the house naked). https://en.wikipedia.org/wiki/Eureka_(word)#Archimedes
It's possible that someday someone like Archimedes will realize a way to test consciousness, and it'll be something ridiculously simple (like Archimedes' submerging the crown in water and seeing how much water it displaces), and we'll all kick ourselves for not thinking of it first :)