Does irmatov still referee?
It's four and a half years between the World Cups so I guess not that surprising for there to be a lot of change. It's still almost three years away too so a lot of experience can be built up in that time.
We are probably influenced by hindsight to some extent. Back in 2011, the likes of Proenca, Cakir, Brych, Rizolli, Mazic, Kuipers, Eriksson hadn't refereed at a World Cup or Euros and all were at the 2014 World Cup. Of course, Cakir/Rizolli did a semi-final/final at their first World Cup as did Kassai/Webb at theirs in 2010.
Most of us probably weren't especially aware of the likes of Pitana, Ricci and Geiger three years before the 2014 World Cup either.