In modern construction we already put continuous insulation outside the 2x4 so that we don't have to deal with the studs and how much worse insulation they are.
I think that's the best practice, also for avoiding condensation, but isn't it pretty uncommon at least for residential builds in the US? Here in Washington, codes were recently changed to require continuous insulation, but I believe that's only with the prescriptive method. From what I've seen most builders seem to continue working around it and doing cavity insulation only.
