Anyway I think my point may have been lost? noise isn't inherent from using tapewounds (they don't create noise themselves), they just make existing environmental noise potentially a bigger issue by eliminating the body-grounding that the vast majority of electric guitars have used for years to decrease noise.
No, your point is quite clear.
My own empirical experience leaves me with a massive question mark on why some basses (logically) start humming along once they receive tapewounds and the others don't. That's all.
BTW, the Bartolini on the aforementioned EB is a humbucker and the bass is properly shielded. Yet it's an outlier in the otherwise silent crowd...