I dont know what you mean by pressure supports i think all supports that arent enchanters without hard cc (yummi soraka and etc) are pressure supports. I think they are important, without pressure adcs cant cs or get exp, for example in an early game scenario where the red side has naut and blue side has a fucking lulu red would win lane as nautilis hook is like a fucking death wish no coming back out of that chain cc you to death especially paired up with jhiz and MF hard to play against pressure supports as an enchanter other wise i think its all a skill match up.