Why...

because Fingerboard curvature, and the resulting curvature of the string system, is also a very important parameter of pickup design.

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.A pickup designed for a high curvature fingerboard will have weak outer strings when used on an instrument with an almost flat fingerboard.

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..A pickup designed for a nearly flat fingerboard will have strong outer strings when used on an instrument with a very curved fingerboard.

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...I do not know a way of making a pickup to sense all curvatures correctly except by introducing adjustable polepieces. This makes it very difficult to use epoxy castings. Epoxy cast pickups have very low microphonics (very low output signal from the impact of fingers, fingernails or picks and little tendency to feedback or "squeal" at high loudness levels). This is a very desirable feature.

Actually, it could be done with buffered polyphonic pickups with gain trim over each string channel, meaning lots of on-board electronics, outboard power supply, etc. It would be unnecessarily complex and very expensive. It is much easier to give us a good idea of the fingerboard curvature.

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The pickup must be matched to the instrument. The higher the fingerboard curvature, the more important this becomes.

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