I see apple as like LVMH, but for phones. It has a minority of overall sales, but a majority of the “luxury” part of the market. This gives them influence over the whole market, but not a real monopoly.
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I don't know how much it made sense when it was to allow blind UI navigation (could have been a "navigation" or "interactions" setting).
But nowadays with the amount of stuff in there, including permissions for password managers, animation reduction, audio EQ etc., it just makes less and less sense.