What if Hextech Chests were tied directly to champion mastery?

Similar to how we get champion capsules with each level, I was thinking that maybe Hextech Chests could be earned at certain champion mastery milestones, like for example reaching 50k, 75k and 100k and so on mastery points with a champion would give you a Hextech Chest (if available), while reaching 250k, 500k, 750k and 1mil would give you a Masterwork Chest.

This idea came to mind after spending the whole day trying to earn an S grade with champions I never really play and which I can't play on the level required to get an S grade (since I don't play them and have no idea how to properly) because I already earned a chest with my champions (I basically play/main around 10 champs). Earning chests from mastery points would honestly be much more satisfying and would allow people like me to play champions they want to play without being left out of the Loot system.