Yeah. For such an annoying issue that affected every application that opens or saves files from/to disk, it was indeed nice to see a mention of "NDA" regarding this issue and its workaround prior to the release of 10.9.1. Too bad it was not fixed with 10.9.1...
It is strange to me that an issue like this made it through all of the developer testing, GM, GA, and still with the first major update. Did not a single tester or Apple developer work on figuring this out for months upon months? Maybe no one tried opening or saving a file with any application during testing? Did 10.9 follow the waterfall model with very little emphasis on V&V?
I have reported several bugs for 10.9, I have worked with Apple Care, and developers focus on whatever and Apple Care support engineers know nothing and have provided no resolutions or workarounds. I always find my answers online or on my own when I encounter a problem that isn't documented as FAD in some Apple doc.
OS X is still far and away my preferred OS for personal use, but I must say that I am growing somewhat dissatisfied with the lack of meaningful updates for OS X 10.9 that address real issues that impact a most if not all users. Two updates from Apple released with fixes for Gmail connectivity means nothing to me as I have never had any issues with Thunderbird connecting to Gmail (even when left open and accessing Gmail on my iPad and/or iPhone) or any other IMAP or POP3 email server ever -- using OS X Mail is like using Outlook Express and if there are problems using Gmail with the default Mail.app, then let users find and use something better. It seems to me that problems for some users a stock OS email client working with a Google service is not as big of a priority as the fastest of the fastest computers taking many seconds to display the contents of indexed folders. And what about choppy animation for Disk Utility when launched (not to mention the missing "OK" message when verifying the primary disk/partition), or timing of authentication for Twitter and iMessage when Notification Center first launches, and why such an increased memory footprint for kernel_task and the seemingly unusual memory consumed by com.apple.IconServicesAgent, and so on?
The task of resolving systemic issues that affect most or all users of OS X should not always result in workarounds discovered and delivered by the user community. Maybe 10.9.2 will fix some things, or maybe the most meaningful change delivered will just be a buggy initial iteration of FaceTime Audio for OS X.
This issue lasting this long has been very irritating and this is all I have to say about it for now. I remain thankful that someone was able to discover and share a workaround while Apple's own support and developers did and do nothing.