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Taking later comments here into context, I'd say I just disagree with EQ2's whole approach and your preference of it.
I'm a visual learner, so I want to see what the boss/mob does. I'm not talking about ground indicators or whatever, but the effects/animations should be visible imo.
Intrepid have the opportunity to build their models with the feature you're talking about in mind. Give those models the ability to perform a super wide variety of animations. And those animations should be comprised of steps that could weave other abilities into them with proper visual representation of that new ability.
In other words, once again, do better. And my attitude towards this is also why I say that I don't want devs to try and keep pace with trackered top pve players, because I want a much better quality of content instead of a lot of it (while not overworking devs to death). Invisible skills and non-existent animations are not quality imo.