I'm not sure where this "center is way more important position than any other position"-strong claims really come from. Seems to me though that this is a more North American thing than European.
I think in Finland the best players have usually been wingers (Kurri, Selänne, Tikkanen, Laine and many others), and I think this pretty much applies to Russia also (Kharlamov, Krutov, Makarov, Mogilny, Bure, Ovechkin, Panarin, Kucherov, etc.).
Tappara won FEL championship last and previous seasons with wingers being clearly their best players. And this hasn't been at all rare in FEL or KHL. I think Sweden might be more like North America in this matter, but I don't think even Swedes are overappreciating the center position in the way that so many North Americans are doing.
I think this is more a cultural issue which has to do with the fact that some countries just happened to get their all time best players as centers, which then after all automatically made especially those countries appreciate the center position way more than other positions.
I honestly believe that there is no single position more important than the others. If you have good enough players at any positions, your team can do really well. The most important thing is to have width, balance, great coaching and great team chemistry in your team. If you don't have all these, it is quite unlikely for your team to do well.