Not all smartphones support FTP and Apple never has. And I dont' know of any device that supports every profile that is available under Bluetooth. As I said in another thread you can use WiFi to sync photos which is much more efficient.
You can send feedback all you want but unless FTP profile is changed to allow what type of files that can be transferred, i.e., photos can be transferred but music files cannot (and this is not going to happen) then Apple will continue to exclude FTP. Apple has sound corporate reasons not to include FTP. If this feature is vital to you there are competitors who include the feature.