I mean the game is pretty damn easy. You don't in any real sense "need" high stats. People just want them.
The system failure is that we are now in situation where value of each class' main stats might as well be directly determined by your class, instead of chosen by the player. Each wizard has the same int, each bard the same charisma etc. I didn't like 4e approach either, which was just giving up and having feats that let you use whichever stat you wanted to for attack. At that point just get rid of ability scores. To have ability scores to matter, but still allowing variety within classes would require classes to be more MAD. Then with the ability choices you could choose to focus on specific areas of the class or have more even spread to be more generalised.