A concern that would get brought up very often on the main LoL subreddit is the inclusion of Esports/pro-player content, with no simple way to filter it out for users that aren't interested in that side of LoL. The moderators never budged on this.
Ideally Esports/pro-player content would have its own community to live in, but a good middle-ground would be to require posts to be labelled with a relevant prefix, like [Esports], [Pro], [Art], [Discussion], as examples.
I think a decision on this should be made sooner rather than later!