It’s a combination of ideas for me.
A) I think 50s/60s P90s/PAFs/Pats, “like” the pure nickel more.
B) Less fret wear (I’m not sure if it’s true, but it is in my head)
C) Modern hot wound humbuckers “like” plated nickel more.
I was using the Pure Nickel Power Slinky’s, but then I stumbled on a couple of sets of Snake Oil 10-50’s and dug em. They ain’t in business anymore so Pearse makes that same gauge set.