With new Swift version is soon to be announced and released developers will gradually adopt new language features which could break source code compatibility. In order to simplify migration process and accommodate new features, developers could use upcoming feature flags starting with Swift 5.8.
Article in Swift Blog goes through use of feature flags with compiler and Swift Package Manager and some examples of these upcoming features.
Swift Blog: Using Upcoming Feature Flags
Developer:Check upcoming feature flags support. Consider trying new language feature where appropriate.
QA engineer:Business as usual.
PM/DM:Business as usual.