I have strong misgivings about the current coaching setup. Coaches are responsible for the game plan, developing combinations and structures (in defense especially), fitness and ensuring the roster has players with the skills and experience to fulfill the requirements of all positions in the team.
At present, and over most of the season, the game plan has been too conservative imo. It is heavily targeted at getting forward dominance, mainly through set piece, and is used to the detriment of just about every other skill function available to the team. We need to see the scrum being used primarily to win penalties dropped from the plan. It is meant to be a quick restart after a breakdown, but the way the Brumbies have been concentrating on winning the scrum battle deprives the backs of quick ball to use to the best of their skill levels.
And, unfortunately, the impact of a forwards dominated game plan doesn't end there. Too often, with the backline set, the play will be disrupted by a forward taking the ball at about the No 12 spot and just dying as soon as the defense is reached. Main culprits are Squeaky Moore and David Pocock.
Also, with the retirement of Ita Vaea, there is no other forward in the team who can consistently get over the gain line or break the defense in close. Yet they persist phase after phase with the locks and backrowers going one out and mostly getting nowhere.
Against the Blues, it seemed that there was no tactic/strategy to use the backline constructively until late in the game when it had already been well and truly lost. Then the problem seems to be a lack of real pace in the backs. Contrast our use of backline play with any of the NZ sides where they are willing to throw the ball wide from the outset and are constantly probing for weaknesses in the defense.
There is also a problem with the roster. Not having a proper No 7 backup is costing us atm. Jarrad Butler is more effective at 8, though very much the workhorse type of 8 that seems to be preferred by Aus coaches currently, and neither he nor Michael Wells are particularly effective ball runners at No 8. The lack of express pace in the outside backs is also causing grief I believe. The Brumbies' present 11, 13 and 14 must be about the slowest in the whole competition. Without pace, the rare linebreaks that do occur can easily be nullified.
Many other problems as well - poor kicking option taking, poor or absence of a kick chase, poor ball handling and passing technique by many players.
It is up to the coaches to identify these issues and to take some corrective action. developing an attacking game plan might be a good first step.