Other things are capped. Mpk and lpk are also capped. There are a lot of unspawn lpk items in particular which are worthless now.

In short a lot of the things which made the game too easy got nerfed.
Life Steal was also nerfed so that 7% Life Steal is no longer 7% on every hit, its not 1-7% and generally uses the lower values unless you're fighting EPs.

This nerf happened so long ago that people now would question why some things got nerfed and other things not. To be honest +stat unspawns should probably also get the nerf along with pretty much anything else and make unspawns basically worthless.

I think the reason that didn't happen is that too many would have quit. At least leaving that in means that the people who played for many many years still have something worthwhile from pre-patch.

You're right I forgot about per kill mods. Unfortunately life steal went from the second most important stat to worthless. That needed a middle ground.