item build path/lifesteal+spellvamp idea

So I have two ideas i wanna get off my chest. 1st Longsword should build into pickaxe should build into b.f.sword. AT into blasting wand into NLR. Why is it not this way? its a pain having to save up for NLR if your team is playing from behind. I think they should follow up on the ruby crystal<giants belt and do it for most items. It makes sense. 2nd
I think spell vamp should heal you from magic damage, and life steal should heal you for physical damage. This way Ad champions would not need wierd items in order to get healing from they're spell casts. Of course to compensate this, we could reduce lifesteals% from items so that champs like zed and riven dont go nuts. I think this would also be an appropriate change to balance out the current state of adc.