Is there a functional reason for negative text, or is it just cosmetic?
I suspect mainly cosmetic. But it might allow to add text where one can not otherwise add it because of space constrains. (If you do not have silkscreen you might want to add as much text as possible on copper.)
I’d say mostly cosmetic, but it does avoid a larger break / cutout in the copper, which means shorter paths, and lower thermal resistance too.
I have seen it used to good effect on the Micro:Bit for example, for nice, clear pin labeling
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