I'm relatively new to ReactJS and professional web development, and I've been using (and learning) react-redux. The layer schema makes sense to me; React handle

I'm relatively new to ReactJS and professional web development, and I've been using (and learning) react-redux. The layer schema makes sense to me; React handles user input, redux manages state, and react-redux ties them together. If react does a better job at speedily handling user input to the point of seamless interaction, then I suppose that would be good. What are we losing from choosing to make a layer itself responsible for the speed of returning output (rendering) from input (user interactions)?