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> literally the easiest file format in existence to safely handle.

Well, which one of them. There's nearly a hundred different subtitle formats, and each one has a whole set of variants. Just Timed Text alone (XML) can have more layouts than one could count, specially since it's meant to be able to replicate technically all previous industry formats.

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Let me phrase it this way: one would expect that the class of file formats for subtitles are easiest to handle (as opposed to say, the class of file formats for images or videos).

On the other hand, images and videos are likely to be handled using some library, which might be better at safely handling the files.

> it's meant to be able to replicate technically all previous industry formats

Even the DVD subtitle format, which is just a mostly transparent image overlaid on the picture? In XML?

Yes, in the TTML2 spec https://www.w3.org/TR/ttml2/#embedded-content-vocabulary-chu...

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