BTRFS has some nice features, but 99.999% of our users would have no clue why they're nice or how to use them, and attempting to expose them in a noob-friendly way requires complexity that we don't need for our "fairly dumb Kodi client" use-case. LE (and OE before) have a long-history of applying the Star Trek principle of "the needs of the many outweigh the needs of the few" when it comes to adding niche things.
NB: I think we bumped the kernel and other plumbing things several times since the things in @lrusaks repo were compiled, so that's probably why the add-on in his repo stopped working. If you know how to self-build an LE image it should be "PROJECT=Blah ARCH=Blah scripts/create_addon nameofaddon" to create an up-to-date version.
