There are three main reasons:

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Decorative programming cannot work at all without imperative programming . The computer does not understand what the developer needs. It only perceives specific instructions that contain a clear sequence of actions. Therefore, in order for declarative programming in SQL to start working, pre-formed instructions are needed.
Declarative programming cannot be used to work with tasks that require access to the program state . For example, if a developer needs to understand whether a checkbox is checked. Decorative programming does not allow tracking vietnam rcs data the state and its changes.
Imperative programming has fewer limitations . This is why it is often used in creative fields. This is especially true for areas where the sequence of actions is important.

Each programming paradigm has its own characteristics. The imperative variant is more suitable for working with animation, graphical interfaces, scripts, games, etc. The decorative paradigm is optimal for computing and working with information. Therefore, none of these sets of patterns and programming rules can be called more effective. Everything depends on the goal and tasks of the programmer.