I'd like to see what impact posting limits would have. For instance, let every user make 2 submissions and 10 comments in a month. One of the issues on every forum is that it takes a lot less time to make a ton of low effort comments than it does to make one thoughtful post. Another is that a small minority end up making the vast majority of the posts (even when that minority is well intentioned).
Another key factor is the community reaction to low-effort posts; Many users of social media are not looking for or willing to put in the time and effort to digest more in-depth discussion, and will happily skip over more thoughtful posts in favour of the next meme or bite-sized thought. In a platform such as Reddit, where votes per unit time are paramount, this results in the burying of most longer discussion.
