The whole (and I think very interesting) thing about the Bendu philosophy - being in balance with the Ashla and Bogan - was that in the EU that philosophy originated from the fairly unique properties of the planet Tython as a powerful and volatile Force nexus.
We don't really know what was going on out there in the Galaxy pre-Tho Yor, but after - after the Tho Yor brought the "Force representatives" of the species (or whatever they were) to Tython, what guided their (the Je'daii) use of the Force was the fact that Tython was a "Bendu" nexus. Any great disturbance in the Force either way - a bunch of sudden deaths on-planet, a bunch of... peace-niks singing Coom By Yah...(?) on-planet - caused violent reactions on-planet; Earthquakes and Storms and other Force phenomena.
So in that very unique circumstance it was easy (I guess) to see how the original way of the Je'daii was "balance". It was the only way to keep the planet from killing people and stuff (I guess).
But why Bendu is supposed to make sense anywhere else in the Galaxy than Tython, I don't know.
Obviously the whole point of Tython and the Bendu stuff that went on there in EU was to have an origin story for the Jedi/Sith split. But it seems to me like it's gonna take some Galactic mental backflips to make it relavent again, in the greater universe.