As the company explains, this bug only impacts users of Word for Microsoft 365 version 2409, build 18025.20104. Furthermore, this problem only arises when users close Word after editing and are prompted to save. After saving their changes this way, the file may disappear.
This issue has nothing to do with SaaS and everything to do with regular software updates (which are not limited to SaaS). Change the package to “LibreOffice Writer” and the delivery to “pacman -Syu” and suddenly the same bug has the potential to hit me. Hell, I have (well, had) floppies fresh from the store that introduced bugs into existing software back when I was a kid. Bugs will always exist and there isn’t enough regression testing in the world to ensure they don’t happen in the future.
All of your SaaS points are correct they just don’t apply here. We should be mad about the lack of testing in this instance.