I am going to make some adjustments to the way coaching staffs work after this season.
1 - Each head coach will have a preferred "system" be it the style of offense they play or the type of defense, which for some will be very specific and others will be open to various styles. The HC's system will be what controls the teams RUN/PASS and BLITZ/COVERAGE ratios for each team.
(currently employed coaches will maintain their current style moving forward as their preferred style of play) This also includes the preferred TEMPO.
Some coaches may be convinced to change their style of attack based on the GM and/or their relationship.
2 - Offensive and Defensive Coordinators will be in charge of deciding what formations are run in the strategy section, they will help develop talent, and will also continue to be your scouts.
This change will eliminate the preseason task of setting the teams strategy, as Coaches will be the ones who do that, making having the right coach for your idea of your team that much more important.
This also will prevent GMs from ruining their teams by hiring power run coaches and then trying to play a air raid offense... etc etc...
But you can still hire a bad combination of coaches and coordinators, so interview well!
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Again, currently signed coaches will not have sudden new problems with their staff, unless their was already one brewing before the change (which you will see as we move forward).