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It's not the size of the React library that is the problem, it's the nesting of components with components within components that is the problem. If you've ever shown source and seen divs 20 to 30 deep, you're most likely looking at html that React produces.

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A React component has no obligation to add a div or any other element to the DOM tree.

Dan Ambramov has stated the reason hooks was created was to avoid nesting hell that was used to manage state. I may be misunderstanding him. I am not s React expert.

I believe "nesting hell" was in reference to obtuse state management architecture rather than DOM structure. It seems like a common misconception based off other comments on this post. Angular inserts a new custom element for every component so it's definitely a problem elsewhere, if not with React.

React needs to borrow the idea of 'zero-cost abstractions' from Rust. Too often I've seen five divs used to add five layers of behavior where one (or zero) divs could have had the same effect.

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