They definitely could have made better use of the eyes. Why is that light to stop the eyes moving even there? The eyes aren't anywhere near the fight if done right except for an unlucky hit when popping the 0 damage or sword light. If the eyes moved everywhere in the room then you'd have to factor them in and stop them moving when they're away from Batraal.
I think SE tried to cater to both the casual and hardcore crowd by adding the speed factor. It might not be the best way of adding hard mode to a dungeon but it's not bad. What they could have done is had multiple pathways with optional extra bosses that open up more chests at the end but by doing so you make the Batraal fight harder. That way the casuals can still complete the dungeon and get some nice loot, but the hardcore have a challenge for even better loot. They could even make all the drops on the hard run HQs of the normal run.
Problem with this dungeon is they had to design the content to fit in the map rather than design the content and the map together. We'll have that issue for quite a while since there's a dozen or so dungeons still locked off. The raids will have to be tailored to their layouts.