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It's an interesting view and smaller forums probably suffer from this more than bigger ones where there is a constant flurry of activity. Perhaps an option to consolidate multiple "activity" instances. "RobinHood liked Alfa1's post and ichpen's post in threads x and Y" or "RobinHood liked posts [...]" with a drop-down.
I can't say I've ever been concerned by this but as each activity is an individual instance I doubt consolidation is that simple.