Mobile applications are updated almost every week, or at least twice a month. So, they need to be tested even more frequently.
Mobile applications should be tested with every nightly build, so defects can be recognized earlier and fixed sooner. Testing the same feature again and again efficiently and frequently might not be the best solution, and can slow down the process of delivery. If we have automation in place for repeated tasks, that can save a lot of time to market. Continuous development and testing enables companies to deliver to market.