Please correct me if I’m wrong, from the photos it seems that boost ends about 2/3 from the heel, where the blue part of the outsole rises to the sides. I haven’t had the chance to try them on, but that would mean that there is actually no boost under the ball of your foot, just a razor thin slab of some EVA? That would explain poor impact protection.

Honestly I don’t care that much about top tier cushion under the heel, in volleyball we’re mostly on the forefoot, either jumping and landing (fore-/midfoot first) or in defence moving around, low to the ground, ready to lunge for the ball. That’s where I want to have this perfectly balanced cushion that you mentioned (responsiveness and just enough protection). Very strange choice from Adidas to place that thick boost right there on this vball specific shoe.