Concerns about shared player knowledge

What concerns/plans/ideas do you have in regards to in match knowledge of opponents abilities or effects? Where if any is the line for what's freely granted as information. When effects trigger, everyone instantly knows what it is that is affecting them, while this is good for balancing solo & swf, it feels vary lacking in suprise as you can immediately change focus to the cause. More knowledge is starting to feel like a limit to match length.

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