Sirrian/Steve’s design motto with regards to changes, nerfs, buffs is to look at 1. Feedback, 2. Analytics/data, 3. Intuition/Design – and I’m reasonably sure it’s stayed the same over the years. My hope is that it helps them make the right call with Elementalist. I don’t think Wand of Stars is an issue on its own, personally.
This has shown up in a few threads from years ago, here’s one:
There has been some mix of feedback from people in the thread with some saying Elementalist is too strong/everywhere and quite a few saying nerfs are not the answer.
It is definitely important to look at the class as important across a range of game modes, which perhaps highlights some game balance deficits in other areas.
Good luck to the team that has to make these decisions 