Ibanez did it for a while - I tried it on a P-bass years ago - didn't like the result. Leo got it right the first time.
No, he did'nt. The case is that most of the people don't understand how it works. EA coil should stay on the standard P hotspot, so nothing changest there. Change is in DG coil, which goes nearer to the neck, so thinner strings sound fuller and more even with EA. As simple as that.