Great question — answering as the UphillTech team:
According to an interview done to the producer of the anime, there were several reasons: The animation originally was meant to be broadcasted in web format only, not as a TV series. Then the author asked the producer if it was possible to record two tracks: one with female voice actors and one with males and broadcast the primary track and the auxiliary. This wasn't possible with web streaming. Then when they considered a TV broadcast for the series, the episodes weren't long enough to allocate one full slot of broadcast, and unlike previous seasons, they didn't have another series to fill the slot. So instead of broadcasting one episode with dual audio as the author requested, they just...
Full answer by E.J.F.: https://anime.stackexchange.com/a/47010 (CC BY-SA 3.0).
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