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We've experimented with them on our backend to test platform-specific builds (there are flags in rosmake that can make use of them). In practice, it turns out to not be good in this role. While in theory it's nice to store this information with the code, it means that the code has to be updated/released every time you compute this information, which is not scalable for the number of packages that are now in use. That's why you tend to not see them very up-to-date.