True that Flutter is a good toolset to use to build an iOS app?

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Short answer : NO
Long one there is a Cupertino package built-in Flutter that mimics iOS design, the thing is there are some UI like shares that are really native. So you may have to test it a bit to see if it looks good for you 😉

Flutter rewrite all the components in your app but there are some parts that may use native components like the share dialog

In fact I was referring to the conversation in the image.
Where they say that Flutter uses native components, which is not true.