I am currently learning about Alkenes. It is given that cis/trans isomerism is either ambiguous or doesn't even apply in cases where the alkene is trisubstituted or tetrasubstituted. To solve this problem, we make use of the E/Z system of classifying the diastereomers of alkenes. In some cases both the methods of classifying diastereomers works.
My doubt is, why are we still using cis/trans system while the E/Z system is better than it? Is the cis/trans system better than E/Z system in some way?