I felt like they finally struck gold with Stone Vigil HM final boss.

However that kind of telegraphing and randomness hasn't happened since. I find this sad because something like that would make a great EX Trial or coil-like boss.
I think the community's response to that boss was very warm but at this point it doesn't seem like it's the direction they want to take.

Personally I especially liked the fact that the graphics and animations told the player what's happening instead of just slapping a red square on the ground to avoid. It finally gave me a reason to take my eyes away from the 20 hud bars and gauges.