To be fair, while the support representatives on the English side, uh... could have done better (let's go with that, lol), you and a lot of us have been pretty focused on this because it's dramatically affecting the experience of the game, while the team working on things like this has a lot of other things going on and are surely pretty distracted by the whole queue situation, which might have been a bigger fire to put out. On top of that, holidays and such.
I think the biggest lesson though is to not release something like this at the same time as the expansion content. It would have been better to do it months before and work out any potential kinks, when there wasn't content patches or expansions going. I feel like they might have been pushed into doing it sooner by the whole business deal aspect, but who knows. It sounds like sometimes the higher ups have different ideas of when things should be done sometimes, and promise deadlines the team can only race to meet.
The biggest software "release" I did so far only went out to around 100 people, and I botched it the very first time in a similar way, doing a bugfix for a program not many use but adding features at the same time, which introduced a glaring new bug. I felt bad about it and didn't have a proper release channel to easily fix it, and basically panicked to revert the new features and just do the bugfixes alone and rerelease, messaging people individually that I knew got the scuffed version (but some I couldn't know about and they'd have to show up to update again on their own). Large companies can't be so agile and quick to respond, but a note just acknowledging it as a known issue like people have said a few times would have really went a long ways. I can't help but feel there are business and legal angles messing with it all that I just can't comprehend.
Good communication helps a lot. Here's a bonus video of stutter when looking from a normal angle, but not from below. Definitely not about specs. https://youtu.be/4XpUjy_zj9c