Because now summoning the fearie doesn't take up too much time or mp dissipation is much more useful, in fact I've seen it beign used on ultimate, let' say now it's an help when you need that extra healing and shield power and/or extra stacks.
You are free to disagree with this, but frankly this discussion is born because of the reason I said and since SE had no intention of support that idea anymore they should simply remove it altogether
Though I do realize they probably won't do it because there might be problems data wise.
True they can fix it with tons of upgraded spells, but the problem is at the root and should be solved there