Apple can use bluetooth for file sharing. It's part of their 'Airdrop' feature, which uses bluetooth + wifi to move files around. (I think bt is only used to negotiate temporary wifi settings, and then the actual file exchange takes place over wifi.)

But once again, the real problem here is that Airdrop is apple-specific. We still have the same fundamental problem that despite having many direct file sharing choices, there is no common way across all the OS/hardware platforms.