You might think text and email are better because they’re faster. You can send them at your convenience without needing to schedule a time. But real-time conversations allow a rapid-fire exchange of information. You can correct any misunderstandings immediately. You can negotiate what you need to do, and what needs to get done right away.
In order to make calls efficient, though, you do need to prepare for them. With email and text, you have downtime to think about what you want to say next, which can be a asset. But it can also be a huge source of procrastination.