Reddit is a mature community that has had time to grow, adjust, and settle in.

Steemit is just a baby in comparison. Give it time, and it will overcome its challenges.

IMO, the biggest challenge we have right now is not the amount of posts or the relatively low quality of content overall, it's simply the amount of content duplication we're seeing (which adds no additional value and increases the amount of content that one needs to sift through dramatically).

I see tons of duplicative material posted, some days after the original. If you try to post a link on reddit, it will check and warn you if it's already been posted. Steemit doesn't have this kind of system yet -- but it should.