Addons being marked as out of date is nothing to do with whether it's the latest version of the addon (the game has no way of knowing that) or even whether it works. All addons have to include a line which says which version of the game they're for and if that doesn't match the current version of the game it shows as out of date.
If you check addon change logs in Minion or on ESOUI you'll often see updates which just say 'Updated API version' 'API bump' or something similar and that means all they did was change that line so the game knows it's current.
All of which means it doesn't matter if addons are marked as out of date or not because a lot of the time updates to the game don't affect that addon. If a game update does affect it you'll know because it won't work properly and might throw up error messages.
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