Now, before you jump down my throat with assumptions. No. I am not suggesting we get boosted LF from absorbing. More like, LF restoring with subsequent absorbings.
One thing I've found is that I run out of LF fast, when I use Regenerate in many cases, and when I hit a certain level of LF, I can no longer regenerate due to LF being too low.
While resting helps, it doesn't help a lot, and the LF never maxes out. This is likely intentional, but I figure I might offer a suggestion that when you absorb from NPCs or people, you can drain a portion of LF to restore LF. It can be capped at a certain amount, or what-have-you to prevent abuse, but I figure it makes sense at least.