You picked really bad parts to complain about. Blitz could have kept his base mana, but the grab cost is actually good for balance. Cho, Elise and Ez ones are all fine as well.
And if you actually looked into it you'd find the sightstone change is actually better for the most part. It hasn't lost cost effectiveness, it just allows you to start putting gold towards the item much earlier. Trying to save up 700g all at once early game is hard, especially when there are so many great cheap items you want anyway early on. Now you don't have to leave fountain having bought nothing and gained no advantage if you want to rush sightstone.
Shaco wasn't really necessary, being a bit hard on him compared to other champs with stealth. Kha doesn't get that kind of treatment.