[OD_]

From what the developer has stated on reddit, it's more like he wants to aggressively make changes on the filesystem right now, before any attempt at mainlining into the kernel, to not end up like btrfs, which in his view, was mainlined prematurely.

[JoshTriplett]

It does make sense to have it rock-solid stable before mainlining, so that people don't get burned by it early on.