No offense, but your opinion is wrong.
HDR is software AND hardware driven. Standard HDR is very simple, take multiple photos at different exposures and combine them together into a single photo. Smart HDR, on the other hand, dynamically determines what the exposures need to be on the fly, in an attempt to create a "perfectly" exposed photo. This requires some extremely complex calculations that the A11 chip is just not able to supply.
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Well, at the time it was the best camera. Shocking how hardware continues to get better. Next year, the new iPhone will have an even better camera.