Using 1-4 rather than 1-20 does significantly reduce the possible range and would put more emphasizes on bonuses from other sources. Care to explain why that is bizarre and broken?
In my opinion it creates clumps within the turn and even actually negates a lot of the bonuses you can get. Consider that the roll is based on 1 to 4 and the bonuses do not, that I am aware actually take you outside that number. So lets say you roll a 4 with a +2, that means anyone else rolling a 4 goes at the same time as you, as does a 2 with a +2.
The D20 spreads out the combat and the bonuses have the potential for a more meaningful impact. Also means they could be worse as well but that is just the luck of the roll. Additionally D20 is standard DnD and there is no real, meaningful reason to change it.
