Man you keep repeating this but nobody was able to crack Note 8's or S9's Iris scanner. Just because a method worked with the S8 doesn't mean it's will work universally for ever with every Iris Scanner out there.
The same guys that cracked S8's iris scanner refuse to test their method on newer Samsung phones. That makes it very clear that it doesn't work anymore. It was never reliable anyway getting inconsistent results(as in it didn't work every time anyway)
No it's just your opinion.
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I clearly specified Note 8 and S9.
It's not an opinion, there is actual factual data that proves 3D mapping is more secure than iris scanning.
Here's your note 8. https://bgr.com/2017/09/05/galaxy-note-8-features-face-unlock-hacked-photo/