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They have a different approach. There are some details under "Same but different" part of comparison to React. https://muut.com/riotjs/compare.html

Some of the features might be redundant (at least for some use cases) so it's not like "missing features" is necessarily a deal-breaker.

Not that you said so, but it's something one can think when he hears that Riot might be "missing stuff".

The design is vastly different. DOM update logic is more straightforward. We realized that heavy diffing is not needed.