Integrating UI rendering into the RenderingEngine with a separate renderUI method is an important step in our code cleanup and organization process. Here's why it's beneficial:

1. Separation of Concerns: By having a dedicated method for UI rendering, we clearly separate the rendering of game objects from the rendering of UI elements. This makes the code more modular and easier to maintain.
2. Flexibility: A separate renderUI method allows us to handle UI rendering differently if needed. For example, we might want to apply different transformations or use different rendering techniques for UI elements compared to game objects.