You might not have to worry about apps that can’t use the 120Hz refresh rate of the iPhone 13 Pro family. As iMore notes, Apple has posted a developer article revealing that iPhone apps will need to ‘unlock’ 120Hz support by adding a key to a .plist file. There’s also a bug limiting the speed for some Core Animation-based apps, although Apple said a fix was coming in a future iOS 15 update.
The iPad Pro doesn’t require code updates to make full use of its 120Hz display, although that may be due to the tablet’s much larger battery. Smartphones are much more likely to take a serious battery
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