Quotes about the September 2019 Avidmaggedon
Mr. Macintosh Blog
"Late Yesterday some #MacAdmins started to report that a few of their systems would not boot properly." 
"root cause for a reboot issue... is unrelated to Avid" 
Google Employee Craig - Chrome Support Manager
"Chrome update may have shipped with a bug that damages the file system on some macOS machines with System Integrity Protection (SIP) disabled"
"If your computer is on OS X 10.11 or later and you haven’t taken steps to disable SIP, this issue cannot affect you." 
"Many Mac users in the editing field try to gleen as much use out of their Mac's and as such, when the OS is updated, a driver or something like TB doesnt work well. They disable SIP, install the "driver(s) needed, and then dont enable SIP back."
"Another common scanario.... cloning to update many many systems. If the cloned drive has SIP off, the units upgaded end up that way. Had a sight with 85 down and that was why.... chrome keystone update, SIP disables and 10.12.6."
apostacy on Hacker News forum
"My biggest liability now is not malware, but updates! " 
security researcher Sean Wright
this sort of issue “does not help with the push to encourage people to regularly update their software.” 
- Google Confirms Buggy Chrome Update Is Breaking Apple Macs