docs: extra clarification on why private state isn't allowed (#2507)

* Some extra clarification on why private state isn't allowed * Update packages/docs/core-concepts/index.md --------- Co-authored-by: Eduardo San Martin Morote <[email protected]>
vuejs · Nov 28, 2023 · 9adbd58 · 9adbd58
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diff --git a/packages/docs/core-concepts/index.md b/packages/docs/core-concepts/index.md
@@ -68,7 +68,7 @@ In _Setup Stores_:
 - `computed()`s become `getters`
 - `function()`s become `actions`
 
-Note you **must** return **all state properties** in setup stores for pinia to pick them up as state. In other words, you cannot have _private_ state properties in stores.
+Note you **must** return **all state properties** in setup stores for pinia to pick them up as state. In other words, you cannot have _private_ state properties in stores. Not returning all state properties can break SSR, devtools, and other plugins.
 
 Setup stores bring a lot more flexibility than [Option Stores](#option-stores) as you can create watchers within a store and freely use any [composable](https://vuejs.org/guide/reusability/composables.html#composables). However, keep in mind that using composables will get more complex when using [SSR](../cookbook/composables.md).