Feature files store use stories known as scenarios which are written in a human readable language. And these user stories mimic user experience on a feature.
AFAICT examples in feature file shade a picture for some user input & expected result, But these examples are not reflected in the steps definition in any way. So including them would be optional, however if implementers do take use of these feature files in understanding the tests then including examples can be a good idea But a few of them do take initiative of looking into these feature files.