How to Test Android Apps Without Rooted Devices
Rooted test devices are convenient until they stop looking like user devices.
Most users do not run rooted phones. They do not have writable system partitions. They do not grant your test framework special powers. If a bug only appears on a normal phone, a rooted lab device may hide it.
For app testing, the better default is simple: test on normal devices first.
You can still automate them.