I'm not sure what the issue is here exactly, but there are surely use cases where a `std::time::SystemTime` (which you can think of as a Unix timestamp) is plen

I'm not sure what the issue is here exactly, but there are surely use cases where a `std::time::SystemTime` (which you can think of as a Unix timestamp) is plenty sufficient. ripgrep, for example, uses `SystemTime`. But it has never used a datetime library. Just because Jiff exists doesn't all of a sudden mean you can't use `SystemTime`. But there's a whole world above and beyond timestamps.