part of the trouble is we only have level 4 to play so far, a Wizard with 14 str and a staff hits for the same damage as a Fighter with 14 str and a staff... if that character happens to allow armour then its even less difference so why would anyone take the Fighter right?
one D&D is a test, EA is also a test so assume 'we don't know yet' and you will not be too upset when things change later on
Luke Skywalker: I don't, I don't believe it. Yoda: That is why you failed.