@Naniii
Y'know what, I never really thought about that. I think it's probably because it's harder to control the S rank adventurers. The only reason Kelvin listens to Rio is because Rio essentially has blackmail material against him.
They said in an earlier chapter that Shinobu inherited the tongue of her family, so I imagine with Taisho's comment about her being a good taste tester she might have a sensitive palate akin to Erina from Shokugeki no Souma, though not as extreme.
Hmm...on p.11 Eva says "It's fairly common in this world". Is she already aware that Shinobu and Taisho are from another world than her? 🤔 I though she doesn't find out til later. Maybe it was a translation hiccup.
@blablablub
Sure he's arrogant, but that's because he's accomplished a lot using the common knowledge of this world. The fact that he can recognize that Touya's cooking is good at means that he's at least not completely blinded by his pride.