Drain life always heals the caster. Often for quite a bit, especially in
/
voodoo decks. Are you going to argue that pandemonium should heal the opponent in addition to your cc spell giving the enemy
more creatures?
Reverse time can be beneficial, depending on the circumstance. (both RT and drain life need edited on your list of effects)
The change to the TU effect would be inconsistent with the way TU works everywhere else in the game.