We used to make just one for a long time, that’s why apple always marketed their new phones and having a better camera. However a multi tool is convenient, but a tool box is better.
Keeping the low-light, wide angle, Macro, General function all in one camera means that certain concessions had to be made to make one camera that excels in each function. This led to a jack of all trades master of non situation.
The Multi camera approach allowed each one to excel at what it does best without having to worry about how focusing on one aspect could affect another, eg how the Macro lens will affect the Wide angle lens. Making over complicated mechanisms/software now is unnecessary, just make the best of each and activate them via software.
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