If you want to fly successful missions with minimal to no issues with any App. It is in your best interest to follow the recommendations that I posted. If you fly commercially, it is even more important. The amount of data that is being processed and logged is not a free tax on your tablet/phone. It takes a lot of system resources to handle that flow of data. Even more so, since the DJI mandatory patch back in June, which basically, IMO, necessitated the need to up the requirements for supported devices.
The App does not REQUIRE you to not have any other apps installed. If you want to have the best experience possible, and maintain a level of safety that IS required under your responsibilities under the Part 107 (Your equipment safety checks you need to do, also includes that iPad Mini 2) Please use dedicated devices! I can guarantee you that in the not so distant future, your drone insurance company, the FAA, etc. will be regulating more than they currently are. Those who practice the due diligence now will be around in the future.
We use(d) iPad mini 4’s for our entire fleet (just purchased in April). We now are replacing all of them (32 units) with iPad PRO’s. More Functionality from DJI and DroneDeploy = more system resources are needed. Also we plan to replace the iPad Drone Controller every year to 18 months of use.
*Of course you can have a few Necessary Apps installed. But each App has storage requirements on the OS, as well as Caching, and memory constraints. If you know how to properly close Apps, and clear memory it will not be a problem. But I don’t think a “used on a daily basis” iPad Mini 2 has the horsepower and capacity to be a dedicated Drone Controller. It will not be able to run multiple missions consecutively over a period of 6 hours. Even if it was brand new out of the box, it would struggle. The recommendations were provided to assist users who want to eliminate any possible mishaps.