Do you think the humans acting all "logical" is psychosomatic? They're less aware of the cultural history that lead to Vulcans suppressing their emotions and acting logical, so they think that logic is more of a racial trait, and thus act logical.
There is a bit of a precedent of logic being genetically encoded with Star Trek Prodigy when
Spock's insecurities being the cause for whatever is happening here is my hope as well. It's a funny moment, but it falls apart under even the slightest scrutiny, so I'm hoping Trelene did it or whatever.
Last season’s Charades also supports the genetically encoded notion. Which goes against everything we know about Vulcans, but makes for fun comedic episodes, so they’re probably going to just keep doing it. Psychosomatic is as good an explanation as any.
EMH: There's a definite neurochemical imbalance in the mesiofrontal cortex.
JANEWAY: Which means what?
EMH: That's where the Vulcan psycho-suppression systems are located. This may be the result of an incompatibility with the Betazoid telepathic neural centre, I'm not sure.