Joe Schmidt's side has gone from strength to strength since bringing England back down to earth with a 13-9 win in 2017 and celebrated St. Patrick's Day in style last March by ending a nine-year wait for a Grand Slam at Twickenham.
"That is a reality check", said Schmidt.
Billy Vunipola especially can transform England's game plan, especially in phase play, given his all-court skill-set.
England boast a wealth of uprising talents their ranks, while some old familiar faces return to the fore, which will give hope the tourists, but the stoic, attritional Irish defence remains as ferocious as ever - couple such with the metronomic kicking power of European Rugby Player of Year Jonny Sexton and the case for Irish victory becomes too strong to deny.
The speed of England's ball, combined with a line-out thrown straight to Tuilagi, enabled the Irish whitewash to be breached after only 92 seconds through May.
Although Ireland ran out Grand Slam winners, there were just five points separating second-placed Wales and fifth-placed England come the end of the tournament.
"These guys can play rugby, my job is to create the environment for them to get better and hopefully we're doing that and we will definitely get better".
Six Nations chiefs would also likely be anxious by their stand-alone Championship becoming a feeder event, while any plan requiring countries to merge their broadcast rights could face resistance from individual member unions.
On their blistering start, he added: "It's part of how we prepare, to start fast we wanted to fly into them and ride through the rough patches and I think we executed that today". "I back myself, but there's a lot of f***ing people!"
"We're a team that is still growing, we're nowhere near our best and we're looking forward to playing better than that and we will".
"We know Ireland and we know their threats, but it's really a case of focusing on what we're going to do", he said. "He still has another step to take, but we don't doubt that he can overcome that obstacle".
"We knew exactly how we wanted to play and we executed it perfectly".