Ranes
Adventurer
Those same new players might wonder why a thief has to make a check to fool onlookers with a simple card check, whereas a magic-user never has to make a check to wiggle his/her fingers perfectly, nor speak the complex words of a spell perfectly, no matter how much battle is raging around him/her, arrows flying, fireballs exploding, etc.
They might. Then again, rules and guidance have appeared that call for wizards to make concentration checks in environmentally extreme conditions and certain combat situations as well, so I'd query your use of the word 'never'.
Will such things appear in the full 5e? Dunno yet but I wouldn't be surprised.