My impression is that many of these HTTP-under-the-hood systems are optimizing for momentary / unplanned usage. Not for permanent shares. Like what you do when, for some unknown reason, Bluetooth is borking out on you and you need to send something to a phone that doesn't have a USB host port. Which happens to me periodically. Or when you need to move a file to the machine across the house but copying it onto your UPnP-connected NFS share is a problem because all of your DLNA devices will suddenly index it.

I think FileTea is pretty great for that.