The motor mount is not symmetrical about the chassis, in other words it is on one side of chassis with nothing opposite it to keep chassis flex common both right to left. So, knowing that, and knowing some chassis flex is key to handling they try to minimize it's effects by relieving it and spreading the weight distribution out. Again, what "appears" a poor design, is actually a benefit once on the track. In other words it's what top racers want, look no further then their results to see if it's working.