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Changes between Initial Version and Version 1 of Ticket #40439, comment 7

initial	v1
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5	5	The main downside is that `file_exists()` lookup times can add up, particularly on Windows hosts. Another factor to consider is that this would potentially push thumbnail generation overhead to the frontend, which could lead to slow first loads (if i.e. a lot of thumbnails were missing).
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	7	To clarify, the Core wouldn't really be changing its default upload behaviors with the above approach. These changes would serve as more of a failsafe, catching and creating images that should exist but don't for whatever reason. :)