Can we please have Real Mastery Rewards?

Point by point why the Mastery system sucks;

1. Mastery 5 as a max is too easy to reach on our main champions. I've been playing different champions just to learn them on a basic level and easily get to Mastery 4 or even 5 if I enjoy the champion. But you've all seen people with their real mains who are stuck at Mastery 5 with nothing to distinguish them, other than 1000,000000000 trillion EXP points on their profile page
2. Reward is a loading screen banner that only your team can see and an emote. But I'm not a douche-bag so I don't get much value out of having that emote (that people seem to solely use to try to piss you off), I often forget I even have it. My team doesn't exactly need to see my emote since they can already see the banner.
3. "Muh Hextech chests" - You get 4 chests per month for an S rank. And sometimes those chests will not even be because YOU played well, but someone else on your team. And of course chests don't mean anything without keys, which only check if you won and are in a premade group before dropping. You also need way more "key fragment" drops than chest drops. Whether or not you like Hextech, being good and very experienced on your champion has very limited impact on the system.