The main difference for me was simply the intensity of defence and it does represent a change of ethos. For far too long defensive "discipline" appears to have been the primary concern, rather than dominating the contact. Consequently as opposed to watching something like the tide coming in as a well drilled but passive line conceded ground, we were treated to England players hammering their opponents backwards. This isn't a risk free tactic as every now and then someone will miss one. However, what it achieved yesterday allowed all the good things that subsequently happened. Irish players weren't able to get into any effective pattern as often they were being smashed into the turf, hard. The weight of the tackles making ball-retention, ball presentation and offloading all the more difficult. It changes everything. Carriers have to be more worried about ball retention and to a degree self-preservation than thinking about intricate patterns and fancy offloads. Every chance to smash someone was taken. Even the Curry on one Earls was marginal.
I disagree, I think this has always been England's tactic from Day 1 with EJ. Our first run under him was built around smashing the opponents back. However it failed once teams realised that England didn't commit to the breakdown, preferring to reset their line. This gave quick ball and allowed teams to take the hit, recycle quickly and expose gaps in the England defence. The difference yesterday was Curry. He was the exact player fans have been calling for who consistently disrupts the breakdown. Yes others mix in as well, but it was his job to be constantly challenging for the ball and it stopped the Irish get consistent quick ball to build anything from. He's not going to be there all the time, but he is so much better than any of the 6.5's we've had recently at disrupting the breakdown.