I’m in the process of converting a large knockout app to react and computed values are definitely what I miss most. They’re defined on the class (normal react practices prefer everything to be a plain object), they can reference other values/computeds internally just by calling this.computed (in react you have to manually chain the results through useMemo calls, and even with reselect there’s the added step of specifying all of your dependencies), they’re computed on demand and track their dependencies lazily (in react if you want a conditional useMemo you have to just early return null from the callback), and they’re conveniently useable in both model code and component code. I haven’t found a way to convert these that doesn’t feel like a complete regression in terms of code readability and ease of use.