What are the advantages of ejusdem generis rule?

An advantage of this rule is there are no requirments for the draftsmen to to write everything that is included and so cover instances that the draftsman may not consider. The Act can adapt to changes in society. However, it is not always predictable what judges may consider in the same category. ejusdem generis alaso allows for judicial law-making (role of judiciary is to apply the law as enacted by Parliament.)