Instead of copy and pasting seasonal activities make a new strike maybe once every few season like you did with proving grounds. Seasonal activities are boring and poorly designed. Leave them out of my precious strike playlists.
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The only issue with them are the sections where enemies spawn infinitely, which runs counter to the skill of managing enemy spawns in GMs and such. Everything else is fine. If they had been called Strikes instead of Battlegrounds to begin with, people wouldn't be complaining nearly as much. If they weren't there at all, they'd be complaining about a lack of content instead.