SteemStem almost completely science-focused, we are not.
I am in discussions with SteemSTEM though as I see their contributions valuable and don't see them as competition or "us or them".
This is not a community split, it's empowering a subset of the larger community much like how communities are planned by Steemit Inc.
/r/science on Reddit doesn't harm Reddit but empowers users who want to talk about science without having to see what you had for lunch yesterday.