Any team based reactions to this games are a bit meaningless. We played a team that we would play against the barbarians. It was more like an old school midweek "dirt trackers" team that met each other 3 days the game than a properly prepared team. Ultimately it won very comfortably and a few players did reasonably well. 

The likelihood of taking more than 4 specialist outside backs to the world cup is very very low. Jordie Barrett has a very specific skill set that is very appealing - he's a very big fullback who is good in the air and has a good long kicking game. That's a skill set we could use against northern hemisphere sides. He's also only 21 so needs game time to grow into the role.

Look at the difference between Mackenzie this year and last year, he is much more in control and that only comes through being in the group. Naholo is the same, he generally looks very polished these days compared to his earlier years.

Having Smith, Barrett and Mackenzie in the squad gives us 3 totally different full backs and lets us play a wide variety of game plans. Bridge and Smith are pretty similar so he would probably be cover for Smith if he got injured again.

I'm pretty sure you will see a different defensive pattern at the world cup. We have played a very vanilla defense all year, which makes sense when you are winning most game comfortably. Hansen has talked about how he builds a side through the 4 year cycle (2017 and 2018 are about building depth and asserting themselves) and not showing all his cards too early. They have tried a lot of tweaks this year, like playing different players in the middle of their pods (look at who were the primary ball handler against South Africa in both games). One of the primary focuses of the All Blacks this year has been discipline. They are tackling notably lower which is resulting in more offloads and quicker ball for the opposition. Look at the way South Africa tackle, they try to first lock up the ball and then keep the player up off the ground. This year the All Blacks have had very few head high tackles, very few cars and they are winning the penalty count.

I'm really interested to see the England and Ireland games. Watching the England / South Africa game live (Dubai is a great time zone for watching rugby) England showed huge resiliency to hang in and win. They should have been down by 20 points after 20 minutes but they hung on and won in the end. They tackle and tackle and tackle and take their chances. Their biggest concern would be their scrum. They look fit enough to hang in against most teams and they finished over the top of South Africa. Their goal kicking is really excellent and they don't care about scoring tries or playing attractive ruby. It should be very interesting.