Agreed on all points, but I'd just like to point out the main reason inline objects and inline functions is a perf antipattern in React is not garbage collection pressure, but rather the fact that they invalidate perf optimizations like PureComponent and React.memo because the objects/functions will have new references on each render. If you use those two together, then you're incurring the cost of individual prop comparisons used by PureComponent/React.memo without reaping the benefit of being able to skip the render entirely if no references have changed.