How would it be Arcad-y? Are you saying that the coaching staff can’t get together and throw a jam session together? They meet everyday after practice. It wouldn’t be too hard to come out of a meeting where everyone was on the same page. It happens all the time in the real (non sports world).
Same thing with player development. How many times do we hear about players making changes in their training routines? How many times have we seen players come out of know where and step in for a team and play above what the people at EA rated them? Look at Brady, Warner, almost every RB Denver had for 5 years after TD.
Since I do not know what they all are I can agree that the ones in line with Accounting Error should definitely be rare. But there are some that can be bumped up. There should also be a way to influence them.
Example:
Get all of your coaches to be the same type or Philosophy and you trigger the retreat more often.
Have a high rated trainer or an elite coach at that position
Make allot of roster moves there by increasing the chance that an error could occur.