I agree. This is, IMHO, Steemit's single greatest growth challenge. Whales currently have myopia and do not value a sufficient breadth of topics to attract and retain a wide audience to the platform.

In addition to the things you've noted, I've also noted that voters seem to prefer quantity over quality. They reward longer posts more consistently than well though out short ones. Sometimes a witty headline and a link to an outside source is very beneficial to the flow of information on Steemit, but those rarely get any valuable votes.

It's disappointing when you realize that the next Matt Drudge or the next Instapundit couldn't earn a living on Steemit, at least as votes are currently dolled out.