Blue Essence for Mastery Level makes no sense at all

What the hell has the Blue Essence to do with my Skill on a Champion? Why do I have to wait ages to get a Key and a Box for getting my new Mastery Level? It is all about our skill, not our luck om boxes! You can open Boxes and don't even get this Blue Essence so then you have to pay for getting it, yeah I'm not gonna pay for it. Mastery Level is supposed to show our skill with a champion, so since I can get as many S as I want with a Champion why I don't get my new Mastery Level without further processes?! That's just stupid!
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