RTK does add some code to the bundle size, yes, but:
The biggest added size comes from the Immer immutable update library. We've already been recommending use of Immer for immutable updates for a long time, so lots of people were using that anyway
The actual logic added by RTK is fairly minimal
The amount of app code that goes away more than pays for the size of the RTK methods
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RTK does add some code to the bundle size, yes, but: