Re: So no way to edit ratings or abilities of the rosters?
"No way to create your own player for Dynasty mode or Play Now like you could 10 years ago."
You can edit all of the player attributes and ratings online, then when you download to console you can change their names there. This works for all players.
"No creating your own coaches for dynasty mode"
When you start your Dynasty it asks you if you want to create your own coach. You pick if he's a motivator, recruiter, etc. You can even chose if you want to create a DC, OC, or head coach.
_________________
Sorry, I just don't see what your issues are here as they do seem to be things you can do in the game. Right now the "play now" mode won't include the edited names because it picks up from the downloaded PC state, but that's something I believe they're working on that may come later. As for your other remarks I don't see them missing from the game.