The reason the AVID community popped it first seems to come down to the fact that this is their busy season, so a lot of their machines were active last night as this Keystone update was rolling out, editors for whatever reason (technical issues or superstition) reboot their workstations fairly often, and, crucially, a lot of editing workstations are using third-party GPUs that require them to disable SIP (whether this is particular to AVID or just an intrinsic property of using the Mac Pros with third-party GPUs, I don't know).
