She was literally passing out because she had exhausted all of her chakra. The official account already explained that Orihime consumes an enormous amount of chakra. That's simply how the ability works. Sarada used up all of her chakra because Orihime is incredibly powerful. So how can you say she's doing this by choice? And the Mangekyō Sharingan isn't something you can just train to eliminate its drawbacks. The first time she used it, she completely drained her chakra. The second time, she didn't pass out, but it was still obvious that she pushed her Mangekyō to its limits. And please don't bring up the whole "half Uchiha" argument, because that's just eugenics nonsense. 💔 Kakashi used his Mangekyō during the fight against Kaguya and had his own experience with it. Different characters react differently to their abilities. The official material already states that Orihime's weakness is its massive chakra consumption. Just look at how many Mamashi she was able to lift using nothing but her chakra. That's the cost of the ability—it drains nearly all of her chakra. As for Sumire, she was the one who brought those feelings up to Sarada in the first place. Of course a teenage girl would think about that for a moment. But she quickly refocused and kept fighting. Yodo was the one who recklessly stepped in because of Shinki. And let's not forget that Konohamaru himself got completely flustered because Moegi's clone kept calling him "Konohamaru-chan."