The idea of having some kind of special syntax in `createSlice` to support declaring thunks has definitely been suggested, and there's other libraries out there

The idea of having some kind of special syntax in `createSlice` to support declaring thunks has definitely been suggested, and there's other libraries out there that do similar things. But, anything we add to our API has to be supported indefinitely. Because of that, I wanted to release `createAsyncThunk` and `createEntityAdapter` as "standalone" utilities first and see how they actually get used by the community. I'm definitely open to potentially integrating them together down the road, but I'd rather take it one step at a time and make sure that we're really solving the right problems the right way. If you do have any further feedback on RTK, please feel free to file issues for discussion!