Should also mention that in ODIs with allocations of overs, you can't afford one of your bowlers in there principally for their bowling, to be so bad so often. It means you have to "find overs from somewhere" and decreases your options. Gives the captain a headache too, does he hope the bowler comes back strong in his second spell and how many bad overs can he let the bowler have? The batting order is pretty strong, might as well include an out and out bowler.