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How can we say that physics is "completed" with unsolved questions such as dark matter, dark energy or gravity?

I'm baffled with the amount of comments agreeing with this sentiment.

Saying that physics is mostly solved at this point is just outright arrogant. Didn't we have the exact same situation around the beginning of the 20th century? Just one little problem to solve - the ultraviolet catastrophe. Sigh...

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I wasn't saying physics has been completely already, only that it seems fairly easy to imagine a future point at which it becomes completed. Physics becomes "solved" as it were, much like checkers, and there's no more physics research to do, only problems of physics education, science communication etc remain. On the other hand, it's not at all obvious that we can easily imagine chemistry one day becoming "completed". Part of the reason is perhaps because the properties of compounds are not straightforwardly predictable from those of their constituents; chemistry remains heavy empirical, computation chemistry is never seen as a central branch of chemistry.

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