I would not agree with your two points that hamsters need bars to climb and gnaw on. Many hamsters have been badly injured from falls caused by bar climbing. The bones are very delicate and can break with a short fall. Bar chewing is also often a sign of boredom and requires a rethink of the cage set up and more stimulation or a move to a different cage. It should be discouraged as again they can hurt their noses quite severly with bar chewing till they are red raw and can also break the teeth. Tank cages prevent bar chewing on the whole. It is normal for hamsters to spent lots of time wheel running. In the wild a hamster would run many miles in a night and this mimics normal behavior.
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