Ugh..

I just played a shield spec Paladin. I think I know a thing or two about how tough it is to seal a kill.

And as a Lich, I can think of MANY classes that would have a much tougher time than yourself in doing it. For instance, you have a mob that follows you around that causes a several round freeze affect. You can scourge, poison and (if I'm not mistaken) healing curse. You can curse, forget, sick an army of zombies and other mobson your enemies, and utilize all those crazy ass Emperor powers you have.
Hell, you can even lash. Not to mention whatever other #### I don't even know about.

It isn't as if you're relying on shield bash, after all.

There's been plenty of Liches in the past, who got plenty of phylacteries and plenty of kills, without relying on cheap tactics.