Would a reasonable compromise be to change the base allocation granularity to 2MB, and transparently sub-allocate those 2MB blocks into 64KB blocks (the current

Would a reasonable compromise be to change the base allocation granularity to 2MB, and transparently sub-allocate those 2MB blocks into 64KB blocks (the current Windows allocation granularity) when normal pages are requested? That feels like it should keep 2MB page fragmentation to a minimum without breaking existing software, but given they haven't done it there's probably some caveat I'm overlooking.