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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
We'll be optimizing file names moving forward, but it hasn't been done in the past. I have probably 1,500 that would need to be changed, so want to make sure it's a valuable use of time/worth the effort. 
Also, has anyone used Media File Renamer for wordpress? Seems this would be a good way to rename files without needing to reupload everything. Thanks!