I think there's a kind of 'magic' needed to give me have that shiver up my spine!
I think flawless technique is the basic requirement these days but there's more to it.
Take the BBC YM... and this is only my humble opinion. In the String final the first violinist was astonishing, brilliant, flashy and truly accomplished... but I picked up the newspaper while I was listening to her and she drifted into the background.
By contrast the violinist, Juliet, and the winning cellist made the room I was in disappear and I was utterly absorbed by their performances.
I think that kind of 'magic' is rare despite there being an enormous amount of truly first-class players out there. As a clunky Grade5 violist I now appreciate how difficult top class playing is, what it takes to get there and the enormous amount of talent and luck it takes to get to the top of the field. That said, there are many players out there at the top of their game who don't
have that magic!
But that magic, wow, .... for me I can usually feel/hear it within the first few minutes.