Yes, you can't be a football muppet. You have to have a workable plan and some tactical nous, and then get the right people in to make it work.the managers still adopt the teams gamestyle and tactics its just they have their coaches instruct that on the training ground rather than the manager having to juggle everything
Its a bit like what Geelong did with Bomber Thompson in 2007 and onwards*
* although that may have also been because of his coke addiction!