We're all so used to trying to multitask, but there's a school of thought that single-task focus is more beneficial. Focusing on one thing is also what mindfulness is all about — giving our attention entirely to where we are.
Dealing with each task in turn can help with productivity and task completion. Our brains can actually only think about one thing at a time anyway, so multitasking is really just switching between tasks quickly – and that's not working with our brains' natural process.