Why Doest support exfat??

I really love this product and the app but the only thing is , it only support fat32 , so you cannot put files larger than 4gb ! I dont understant why ! I know that since ios 7 or 8 idevice support exfat so why the the ixpand and the app doesnt not support exfat to ! Thats a big problem for me ! I wish they will fix this soon

Matheking77 about SanDisk iXpand™ Sync, v1.2.13