That info is already obtainable by checking the bottom right hand corner, but since its all the way on the other side, I can't keep an eye on the minimap at the same time :/
the few extra seconds it takes to select them and see their exact health is a big difference in a fight and can be unfair against people who dont have it
This has been asked so many times...
Seriously why cant people use the search...
Answer has always been no because it would change the gameplay so much.
Disabled as of 0.1.36, pending an S2 decision on this: "because some people felt it wasn't fair and we haven't made an "official ruling" yet on whether or not we want to make that [health/mana numbers] available".