People write about Steemit because that is what the audience wants to read and vote for. I wrote an article about the Olympics but I think about 7 people voted for it including me. With hindsight I should have posted it on reddit because they're really getting into the Olympics over there, and would have enjoyed it and discussed it more. Of course there is no pay on reddit, but no pay for that kind of thing here anyway..
If you really want writers to write about other stuff, you need to vote for non-Steem stuff. Otherwise you are sending a signal that Steem and Steemit are all you want to read about.
Steemit as it is is going to make all, including whales dolphins and whatever other creature, drown
But who is 'the audience'? The money is only being paid out by the whales, and the money is what gets attention, not votes. We don't have a true signal of what people like to read here.