Well for the reason I just stated. Crossing ability has slipped out of the game to some extent.
On top of that how often does a fullback get into such a perfect position to deliver such a cross? Not all that often I'd guess.
But once in that position, with the time he had, you'd expect a top level professional to be able to put the ball in the kind of area 7/10. It's not like he's swinging the ball in from some improbable angle.
Not having a go at Shaw here, I think he's great but I grew up watching division two players who could deliver like that whilst on the run. Once upon a time it was a skill all good wide players had to have.
Edit: I should add the delivery from the freekick was very good. Again I think top level pro footballers should be able to do that at least 6 tes out of 10 but it was still a beaut.