I consider myself a Beginner/creator.  I have only been on steemit for a couple weeks but I already love it and hope my posts will get better and better.

As someone who has written professionally for other online outlets, and  joined steemit recently, the feedback I would give those in charge is:
-the uniform user post format is nice, but not altogether intuitive to non-computer people.  Adding photos should be so hard.  I know it isn't really "that" hard, but you have to understand the average user.  Any extra step in the creative process is a deterrent and I think a lot of people who join steemit don't go on to being active users because of the seeming complication of the currency types and the lack of formatting options for posts.  Again, people on here might say "well fine, we don't need those kind of people."  But those are the vast majority of people creating profiles and then, sadly, letting them sit dormant. 
- I wonder sometimes how much feedback the creators search for from "average" people, people like me.  When you surround yourself with cryptocurrency enthusiasts and computer engineers, they will tell you what you made is great because they are already understand it all and it was made by someone like them.  But if steemit is ever to be a global force, it really needs to be simplified.  Again...I know it is "simple" to the people who are already using it...but it just needs to be more user friendly for the other 95% of the world who don't understand cryptocurrency or how to upload photos without dragging and dropping.  I hope it thrives though because it is an amazing idea!