In our case, the primary use case is first for tests, especially for Android phones. There are many versions and many different brands, such as Samsung, LG, and Huawei.
We want to test our mobile apps on different devices.
We are also using it for log tests. We have campaign dates for eCommerce, and there are 100,000 unique visitors. As we cannot test it into a log environment, on our site we make our log test using another feature.