What's "all while" mean? Does "all" have to be added there?
Answer from a Native speaker
One could omit "all" here. However! The "all" emphasizes that while doing one important thing, they can do everything else too. It also works well since there's quite a long list of things before the final point, whereas "while" by itself is often with one other action. Ex: How am I supposed to cook, look after my little sister, and clean, all while studying for my test tomorrow? I'm not superman. Ex: How am I supposed to look after my little sister while studying for my test tomorrow?