I can’t remember which manufacturer it was, but years ago there was someone at shows who played a live instrument which faded into the hifi system. It was very convincing so perhaps we were ignorant, full of it or couldn’t hear very well!
The ideal of hifi is to create a realistic illusion of the original; it doesn’t have to sound exactly the same as the original but if you are listening to, say, a good recording of a Bach cello suite, close your eyes and think a cellist is playing in front of you it is job done. I suspect that different people will require different types of equipment to trigger that illusion; it depends what we as individuals are sensitive to. I think I am sensitive to the illusion of a performer in a realistic space and the detail of, perhaps, a bow on a string, others may find different factors create a convincing illusion.
I feel a bit sorry for those who can’t understand, and have never experienced it. Keep listening and trying things, ignore limiting dogma such as “all a Hi-Fi can do is accurately reproduce the file, cd,record”, and you too can enjoy a convincing illusion of the real thing, although I must admit it gets tricky with a 100 piece orchestra but very doable for classical chamber music. To suggest that those who have systems that manage it are full of it, ignorant, or can’t hear very well is ignorance in itself!