Why is steaming-hot sushi rice also wrong, even if cold rice is bad for nigiri?

Answer: Pushes past warm zone

Pushes past warm zone ✓ — Right. The target is not heat for its own sake; it is a narrow warm zone. Mizkan gives a 30-40 C shaping range and warns high temperatures can cause condensation and stickiness, while The Sushi Geek says body-temperature shari is ideal and too-warm rice is not harmonious with toppings. Steaming-hot rice overshoots the whole design.

Improves cold contrast — Not quite. A slight warm-rice/cool-topping contrast can be pleasant, but steaming-hot rice makes the contrast too aggressive. The same sources point to a controlled middle range, with body-temperature shari as the ideal. Turning the contrast up to maximum risks splitting the bite into hot rice and stressed topping instead of making one clean piece.

Boosts every aroma — No. Heat can release some aromas, but it does not improve every smell and taste at once. NCBI's sensory review notes that temperature changes the taste profile unevenly, and sushi sources warn that too-warm rice loses harmony with toppings. The goal is balance, not maximum aroma volume.