EX4 was a quick-paced one, like Barbariccia and the ground being an electrical circuit was used in many mechanics in quick succession, always with a different solution (avoiding to connect, sharing an AoE from the other side, making a chess-like pattern and absorbing the towers) on top of avoiding slashes by getting the order of the attacks.
M5S was about the same, many small movements made it like a tempo encounter.
M6S adds are satisfying to prog as well, as long as you're with competent players.
I haven't had enough time to test out M7S nor M8S but it seems your main complaint is that you want them to be more innovative than they can. Normal raids are harder and yet offer a large variety of mechanics so I'm not sure what more you're asking for ? It still is made for players who aren't experienced / won't have to be coordinated. For any other content, blind progging make them much more thrilling but most people are prone to reading and following a guide, then claiming things are too easy / straightforward although they never even tryed to understand the logic by themselves.