Technically, it would be nice if we were able to hide certain dev posts or posts in some languages from the trending page by "default" or at least through user settings.
This would likely help retain many new visitors and newly signed up users too. Whether anyone would still use that particular tag or not would be a matter of enforcement though.
I don`t think anything should be hidden for the user. This is very dangerous actually. But Steemit.com could introduce an individual page for the user which is only showing stuff what interests him.