Do you think that some NBA teams need to stop playing some Power forwards at the Center position?

Im an old school guy. So to me a Center has always been someone who can block shots as well as rebound. In todays game I have seen teams put players like David Lee, Matt Bonner, Chuck Hayes and Fabricio Oberto at that position when they should be playing Power forward. Another player that I should mention is Spencer Hawes of the Philadelphia 76ers. Why cant some teams just find true Centers and stop doing this?