Let there be an app that offers, for starters, these basic functions:

• Ignore function/banlist/block. There are some accounts that have proven to be pure noise generators, nothing more - no need to even display them. Simple filter.
• A working "follow" function. In its simplest form, a text field to add names to; in a more advanced form, it would be possible to group them according to topics/interests/"circles" (friends/musicians/colleagues/analyists/whathaveyou). steemstats.com already has implemented the feature somewhat by reading the follow data from the blockchain - which is recorded by steemit, but not implemented yet. This would allow to have something like the Facebook feed: content of people one chooses to follow. With checkboxes to ex-/include posts/replies/votes, of course. Relatively simple filter.
• tagged browsing. Would allow the user to specify the tags by which to filter the "new" and "trending" pages, maybe even in the form of (steem OR steemit) AND economy, for example. Simple filter too.
• Bookmarks/favourites. Simple, small database.

Traders will have even more wishes.

There is a huge demand and only little supply so far. piston.web almost comes close.

> so you keep going

Please, do! I have nothing to offer than, hopefully, certain rumors about a certain market that is soon going to fill up, steem willing, stake your claim.