Why didn't we switch to 4e/5e?

[Scowling Dragon]

while yes 5e "balanced" the classes the restrictions made to keep it that way stifle the creativity too far.

Again not REALLY. Classes remain that are much better then others. And within those classes there are archetypes that are better then others.

Do you want to take half damage from all damage sans mental when raging? Or B: get an extra attack and be exsausted at the end?