It would seem that the All Blacks have an obvious way to improve Beauden Barrett's goalkicking during the Rugby Championship, which is to hand the duties to his younger brother Jordie.
That's an obvious scenario brewing as Ben Smith won't play beyond the first two tests, paving the way for Barrett junior to come into the team at fullback. If Barrett senior hasn't kicked so well in the Bledisloe series, no problem, let junior, take over.
Jordie kicks for the Hurricanes and his technique looks smoother, more reliable and his accuracy more consistent. It makes sense to imagine he can assume the same role with the All Blacks and yet it's not really a wise option. It would effectively be avoiding the issue rather than dealing with it because the All Blacks need Beauden rather than Jordie to be their preferred goalkicking option.
Project forward and it's as close to a certainty as these things can be that Barrett senior will be the All Blacks No 10 through to the 2019 World Cup and possibly beyond. Any key game in the next three years and Barrett, if he's fit, is going to start at No 10.
The same can't be said of Jordie and the safest path for the All Blacks is to assume that Beauden will regularly be the only recognised goalkicker they have on the field. For that reason alone, he has to keep kicking in tests as that is the only place where he can test his technique under pressure.