Fwiw, I don't think iq is implemented perfectly. There should be more freshman coming into college with a b range iq. It is true that these freshman are not always very useful but, outside of high DI, the players ratings usually aren't that ueful and will be better by junior year both because their ratings have improved and their IQs have improved.
Freshman can absolutely have an impact on a team. Can five freshman in a starting lineup be effective, probably not. Does iq perfectly reflect real life basketball, almost certainly not. Is it better for game play (although it is a simulation it still involves game play) I think so. Just because a player is familiar with the offense or defense does not mean they will never be. In the wrong place. I think iq does a decent job of reflecting this.
Every year there is a team of mostly upperclassmen in the NT (real life) that does well against a much more talented but younger team. Isn't this attributed to iq?
Coaches have the ability to assign minutes to team offense and defense practice. If this is your priority put more time into it. Seeing a player come in as an F sucks but it shouldn't be looked at as 0 knowledge of the system. And also that F grade lasts literally one exhibition game, two if the guy is a complete moron.
Sure iq could be improved, but I think the best improvement would be for some freshman entering college with higher starting IQs, not implementing a system to increase the rate of improvement