In Nov/Dec, we were doing this with client-side updates. Before that, the team was working on streamlining the build/publish processes, as they were super error-prone and took way too long to promote a fix from our internal environments to the Live servers. I'm not sure if you noticed, but PS2 down times for updates have been reduced dramatically over the past few months, compared to previous years.
Over the past several weeks, we've had to dial is back a bit due to the team's focus on the Escalation update. But yes, we plan to transition back to doing this after the update goes live.
Also, as a few pointed out in this thread, depending on the changes/optimizations we make, some will require a full server bounce. But many; especially client performance improvements, can typically be hot-fixed without any server interruptions. These are the updates that can happen fairly frequently and the majority of the publishes we were deploying in the final couple month...
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