r/rocketleague made a decision very early on that highlights would be allowed every day as regular posts. Subsequently, the sub turned into a giant highlight reel. Sure there were a couple of posts here and there on patches, RLCS, rare items, etc. But seeing highlight after highlight really killed the community discussions.
Making a request to the mods that highlights become a sticky-only or one-day-a-week thing as opposed to the core focus of the community.
The problem with r/rocketleague is that all the other topics surrounding the game have gotten their own subreddits - r/rocketleagueschool, r/rocketleagueesports, r/rlfashionadvice etc., thus leaving the main subreddit with mostly just highlights. All these other topics should initially be posted in this one community. If/when the activity becomes too much, only then should these topics split into seperate communities.