Why not update official Arduino SD library with newest Geiman's one?

[q2dg]

Some parts of official Arduino SD library (https://github.com/arduino/Arduino/tree/master/libraries/SD/src) are based in an old version of Greiman's one (https://github.com/greiman/SdFat). The newest versions of the latter has some interesting improvements, as support to long file names, use of multiple cards, etc. I think it could be worthy to valorate if these changes could be merged.
Thanks.

[agdl]

This issue was moved to arduino-libraries/SD#6