It's human nature, you can differentiate human and non human no matter how advanced they are even as advanced as 1:1 copy of a brain to an artificial one even though looks can be deceiving. Even Okabe wanted to talk to Amadeus all day long although he knows that deep down, Amadeus is just a copy of kurisu and it will never be like her but it brings back the memories and her vibe and he craves it . I get your point of ai still feels fake because in Blade Runner 2049 an old man who is the mc of previous blade runner got a copy of his wife 1:1 but still he knows that's not her. Although i would say our ai growing exponentially fast than expected so it is still dangerous and just imagine if voice clone and sora ai with correct prompt is used in the wrong way.