@EConklin
The reason that you were only seeing JPEG2000 was likely that you had a 16 BPC file.
Standard JPEG only supports a flattened image (no floating layers), 8 BPC, no alpha channels. If the current file doesn’t meet this criteria, then one has to Save a Copy, or enable Legacy Save As in your File Handling Preferences/Settings.
Although JPEG2000 is better than JPEG, it never gained widespread adoption and acceptance by various industry bodies and consumer software developers, which was the key to it's success or failure.
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