Context on PBE changes

two things. First off is the PBE elise changes. I can't figure out if it is a buff or a nerf. Taking the spell vamp off of her spiderlings and giving her a base heal on her spider form attacks...what does this do exactly? Is this supposed to help or hinder her?

Second, Runeglaive. Is magus OP? Why is it going to be removed? And why does it only give 40 AP? I know it gives mana and a spellblade but 40 AP isn't much especially when the warrior enchant gives 40AD and armor penetration.
You haven't considered keeping both as options? Maybe reduce the CDR or AP on magus?

I'm just not understanding what these changes are supposed to be doing. Elise needs buffs for sure after her fotm episode got her nerfed into a splattered mess and the magus enchanrt never seemed to be too out of control. So, can i get some context?