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Because apart from having better looking caliper i see no gains of. Several gains for OE rears though, eg. better wheel clearance (matters, if for offroading one tries to fit some 15"-16", though possibly non issue, as wheel set probably will be same on all four corners, and there might be reduced clearance in front already due APR front BBK), ability to use OE parts on it (sometimes for example aftermarket pad selection is better for specific OE calipers then for specific BBK), and assurance that brake bias is as manufacturer intended (with possibly better braking distances, not possible stability issues, nannies are also designed around expecting bias) and around which possibly some aftermarket suspension or aero parts are designed of. If extra heat capacity in rears are not that needed (main actual benefit of BBKs) see no sense to change them out 'just because'. Or if changing, then to kit that is designed to keep bias same.
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