Digital marketing consists of a lot of different tools. This also means that you have to keep moving data from one place to another. Without automation, life is pretty difficult for a digital marketer.
Some digital marketing tools talk with each other very well, but some do not. This means moving data from one tool to another is a huge pain. Many digital marketers spend several hours a week trying to move data from one tool to another.
For example, sometimes I would need to update my email subscribers from my landing page to my email marketing tool. This process includes extracting data from one place and updating it manually in another tool.
Many digital marketing tools provide API support that makes it easy to transfer data. But digital marketers are not developers. Coding and programming are alien to us and we never actually get around to using the API for automating tasks.