why isn't a realistic trainer mode developed?
a mode where you realistically interpret the role of the real coach, where you have full control of the tactical and training part while for the transfer market you can interact with the club and the sporting director, make your requests and everything that coaches do today modern but then you have to work with what the company can make available to you.
I know it can be done through responsibility management, but it's an adaptation that the game doesn't recognize in many mechanisms.
there is an Italian expert (fm theory) who has published his Coach Mode, with all the settings and the rules on what can and cannot be done, it's very fun, but it would be even more so if it were an original mode of the game