I am constantly amazed at how people are stuck in their belief systems (alternative facts) here. Here are the facts based on 45 years experience with the issue:
1) the string does not act as an antenna to attract noise. The string does not cause hum in any way.
2) The string connects the players hand to the parts of the guitar that are connected to ground (bridge, output jack, control plate).
3) Contrary to what EMG recommends, I have always had to shield and install bridge ground wires for hum control for musicians playing in noisy environments, especially stage lighting (vari-lights) and old building wiring.
4) The risk of shock with having a bridge ground is so low, in it a non issue. If it happens, it is in when the player has his hands on the strings and simultaneously touches a powered microphone with his lips or hands. Dealing with pros for 45 years, I can tell you it is a non issue.
5) For those who say I never get hum, it is only because you have not had to play in environments that produce it.
6) Shielding can reduce the hum by 90% but a string ground in still needed in noisy environments.
7) Shielding and proper grounding cannot eliminate 60 cycle (single coil) hum.
8) The single most important part of the equation regarding shunting "noise" to ground is the human body. When you touch the strings, your body completes the ground and shunts the hum. This would also happen if you touched the bridge, the control plate or the output jack.
9) Given #8, in order for you to complete the ground while touching the string, the string MUST be electrically conductive, otherwise, no connection is made between the string ground via the bridge.
10) Most coated strings are NON Conductive, defeating the connection to the bridge ground. As a result, there is no hum reduction when touching the strings.