The functionality of ecash-script has been replicated in ecash-lib. We know longer have any monorepo apps depending on ecash-script.
Additional parsing methods will be built out in ecash-lib. ecash-script is legacy, it is still a JS lib, it has not been supported, and the OP_RETURN parsing and writing methods in ecash-lib are more sophisticated.
So, lose it. It has already been marked as deprecated on npm.