Yes, I do think it's worth switching stances during a team hunt.
When I first read the vocation adjustments, I thought I would have to keep switching stances constantly depending on the situation, and honestly, it sounded like too much work. I literally thought it would be one more hotkey I'd have to worry about. After several hunts, I realized that (at least for me) it doesn't work that way.
I usually decide which stance to use before starting the hunt or whenever the situation changes completely, not every few seconds.
For example, if we're hunting in a new spawn, we're still not comfortable with it, someone from the team is missing, or I simply feel there's some risk, I keep Shared Conservation (the healing stance) active during that part of the hunt. I'd rather have that extra margin to keep my team alive than squeeze out a little more damage.
On the other hand, once we know the spawn well, the EK has good control over the boxes, and the hunt feels stable, I switch to Elemental Synthesis (the damage stance). That extra 10% Magic Level is definitely noticeable during a long hunt, and I think it's worth taking advantage of once survivability is no longer an issue.
Personally, I'm not switching stances every box or between every pull. It would be way too easy for me to forget more important things (I'm incredibly absent-minded), like healing someone or paying attention to a mechanic in the spawn.
My advice would be not to think of stances as part of your spell rotation, but rather as a decision you make based on how the hunt is going. That's what has worked best for me.
Just to clarify, this is how I use stances during team hunts.
When I'm hunting solo, my priority is different. I usually stick with Elemental Synthesis, since I'm already managing my own healing all the time and my main goal is simply to kill creatures as quickly as possible. For me, the extra damage is usually the better choice there.
