What are reasons for choosing "bring-your-own-container"?

In week 1 of course 3, the instructor reviews the 3 options in AWS: built-in algorithms, bring-your-own-script, and bring-your-own-container. We’re told that it’s the most customizable, but doesn’t bring-your-own-script option already allow you to write your own algorithm, training, and inference logic? As long as you’re using an AWS-supported framework like Tensorflow or PyTorch, I don’t understand what practical reason you’d use the ‘bring-your-own-container’ option.

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