iOS inconsistencies (modal vs push)

The iOS settings app has some inconsistencies I want to bring up to discuss the reasoning for their choices.

  1. Settings > General > Language & Region > Region uses a modal with a filter input.

  2. Settings > General > Language & Region > Calendar uses a push.

  3. Settings > General > Date & Time > Time Zone uses a push with a search input.

I can understand why #2 uses a push because it sort of acts like radio buttons except you go to a different page. But #1 and #3 confuse me. Even though they use different type of search/filter, why do they navigate differently?

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