The closest we could get to original twisting mechanics in tbc with this implementation is just having SoC keeping that .5s buffer. This version is still easier to pull off because it doesn’t involve watching for the timing of SoC animations that may or may not happen.
Don’t ignore this part of what you quoted though:
They are clearly looking for something approaching accuracy here. There are already some changes with this method of twisting instead of spell batching. I can’t imagine blizzard intended to fully change how twisting interacted with our rotation AND give us a 10-20% dps boost by making that change when they have already stated they have no plans on retuning classes.
And, as has been mentioned, the current ptr/beta twisting setup is currently on its third iteration. The changes to it aren’t just bugs.