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Is fiber similar to what glimmer is to ember? Is it a big enough improvement to reconsider using react instead? (I was stoked on the glimmer stuff).

React is mostly an API contract (React.Component) and it didn't change. If you didn't like it for this reason, you won't like more.

If you left React for performance reasons especially related to real-time updates or animations, well this version is better.

Since Glimmer is implemented as a bytecode VM, they were able to go ahead and pull in many of the improvements that Fiber brings to React: