Why Doesn't Adobe Software Resume Rendering from Where It Fails?

The After Effects Render Queue will queue up failed renders to continue from where they left off, but not all file formats allow for continuing a render.  For the file formats that allow for it, it would be great to have having something similar in Premiere Pro and Media Encoder to quickly continue an export.

Image Sequences allow for doing so because each frame is an independent file.  Mezzanine formats (like ProRes) have a good chance of doing so as the first segment can be quickly appended to the second segment later.  Long-GOP formats (MPEG2, h264, h265) that are multiplexed do not allow for this as they have to be rendered from Media Start to Media End with a consistent GOP structure.

Even when Image Sequences and mezzanine formats fail with the After Effects Render Queue, we need to check the most recent frame at the time of failure.  For example, if rendering 900 frames and it fails at fame 450, After Effects will queue up the failed render to continue from 450; however, frame 449 may not have completed as expected and we may need to adjust the continuation to render from 449 instead of 450.