I'm glad to see this altruistic honest approach to curation. My only concern with upvoting Steem related content (mostly) is this creates an echo chamber. A new person coming in will not see this as a balanced community. They will see this as a "only steem content is rewarded" environment.
I would prefer a balance of 40% Steem related and 60% other. Perhaps this is an approach that can be eventually phased in.
In anycase, I'm happy to see these changes in Steem overall.