The first time through, I watched this exceptional show from a conventional, literal viewpoint. Had I been eating, I would have wanted to puke.
However, after having read Galbraith’s thesis on moe, I rewatched the show. Galbraith enabled me to interpret it metaphorically, and it made perfect sense.
Wasurenagumo figuratively depicts a new otaku solution to the problem of female companionship. The high school girl has been supplanted by a creature of boundless internal fantasy.
The creators might also be implying that the loli-spider waifu will undermine society more effectively than the original onibaba-spider demon.