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Because one platform supports more options and when using that control on a different platform there are exactly two choices: break cross compatibility or reimplement the control.

Add evolution of controls and idioms over time, and it's literally impossible to always unify: not all platforms evolve their non-trivial components in the same direction.

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I'm glad I asked this because your answer suggests this is the main problem with cross-platform UIs.

What do you think is the right thing to do? To have a common denominator kind of approach where a control works on all platforms but with fewer features, or to reimplement the control?

Do you have an example handy of a control/idiom that caused this problem?

It sounds like reimplementing (emulation) is a good thing.

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