The jump from board user to board owner is steep! 
There are so many settings a board user can’t do, but that a board owner can. There needs to be more levels supplied. Most particularly in ‘private’ boards.
My suggestion.
- Viewer of board only
- Limited editing - Only see and or edit items assigned to you
- Full access item editor - Able to see and edit all items in board (however not able to structurally change the board)
- Board owner - Can do everything in board
I frequently find there are people in my team that need different view/edit options in the one board and the options are so limited! It’s a massive road block for us, as we have employees, contractors and clients all in our CRM. So one blanket rule doesn’t work when applied to all. More options are needed pretty please! 