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While I’m throwing random Naruto hcs to the winds:
Uchiha were actually incredibly expressive by their own standards, but a side effect of being a clan of people with Super Detail Vision means that even those without the sharingan or with the sharingan not *on* means that they don’t need to move their faces much to convey a lot. Which was why to outsiders they looked so stiff and stoic for the most part. Because why bother doing large expressions when all your loved ones can see how overjoyed you are with just a tiny smile and the deepening of the laugh lines around your eyes?
This trait also makes them truly scary during police investigations because if you have *any* physical tell that you are lying, they *will* see it and use it to their advantage, with or without their sharingan on. These people are so detail oriented by default it’s insane. They also can have the Book literally memorized and ready to quote chapter and verse at you down to the grammar because their brains have evolved over generations to naturally memorize and rapidly process and catalogue information to compensate for said Super Vision.
This means, by extension, that Uchiha like Obito and Shisui who register to outsiders as the “normally expressive ones” are actually the Uchiha equivalent of Might Gai running down the street screaming loudly about Emotions and Youth.
That or Shisui is not actually that expressive by default (tho we know Obito is) and he just learned how to do that because he realized it made people more willing to talk to him and also it makes his relatives twitch in the Uchiha version of screaming “MY EYES” and he finds that really funny.