This is one of the downsides of having a simple combat system. With so few options, and a high cost to make any signifigant change you need to keep combat straight forward or else the game becomes to costly/difficult for players to do anything. If you look at GW1 however which has a good combat system, you have the opposite issue where content can be hard, but its down to the player to solve it with a build. While this is the better option, it can make players demad people meet certain build requirements.