abstract classes provide flexibility for maintaining backward compatibility. Because they can include both implemented and abstract methods, it's easier to extend their functionality without disrupting existing subclasses. This is particularly useful when scaling a system or adding features. Interfaces, while now more versatile with Java $8$s default and static methods, didn$$t offer this level of flexibility before, making abstract classes a better option for such scenarios in the past. How do you think developers decide between the two now, given these changes?