Alternatively maybe being dual language means you're overall smarter. It used to be seen as a cognitive drag mostly because language development is near inevit

Alternatively maybe being dual language means you're overall smarter. It used to be seen as a cognitive drag mostly because language development is near inevitably delayed. But by the time you're getting into your teens bilinguals pretty outperform monolinguals nearly everywhere. The mistake people make is try and assess cognition in non-native language. But you can't do that because nearly all tests are standardised to the first language (and actually English usually). No doubt being bilingual L1 English L2 Chinese is likely powerful and much better than being Swahili/Laotian in terms of opportunities