I dont know how I feel about this. On one hand it is very useful to know the opponents health, but you can also use them not knowing your health to your advantge. You can either make yourself look lower by fake running, therefor having them continue fighting without running to finish you even if low, or if you are low you can try to keep pressure on them and act like you aren't hurt. Adding a health bar would remove this whole section of strategy, however others don't care about the stratgy view and just want to see the enemies health.