Linked data & vertex groups confusion

I guess there is some reason for the current design, but I find really confusing that after localizing an object and keeping just the object’s data linked, the vertex groups end up in a weird state (from the user-perspective) when their list & names are localized, while their actual state (weights) are still linked.
It is even more weird when vertex colors and UV maps are still linked completely, while all these 3 are located on the same pane (object data).
I don’t find this behavior intuitive and it caused me troubles during the work on my projects when I changed an object in my library and everything got updated… except vertex groups (i.e. new groups weren’t added).

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