Well actually, now that I think about it. When you couple some of her new tools with charged steins, I can see it being very very deadly to have steins not be rebalanced.
I mean Arrows of Heaven is good now, like really good, with so many followup options. Depending on it's peroration, it might even be included in some of her higher damage combos. With the addition of that as a reliable zoning tool, I think her overall zoning output will remain the same.
And even if stein hits are slower, faster steins means faster special laser, which is a huge buff.
I think all the small things added up too fast.