Getting Keys Is Far More Difficult Than Getting Chests. Slight Idea
What if getting an S+ gave you a chance of getting a key instead of a chest when you had a chest available to get on a champion?
Nothing feels more pointless than having 7-8 chests, 1 key fragment, then getting an S on a champ and getting another chest. It is just like "might as well keep it Riot". Key fragment drops are a bit random and derpy compared to how easy it is to get tons of boxes. I'm not saying just hand out free keys, but an S+ specifically seems like a good way to reward someone with a key, or at least give us another key fragment, or something. Otherwise it just feels like a tease.
I mean, I don't speak for anyone else, but personally I'll never spend rp on hextech crafting, so I'd like to be able to at least earn them to some extent rather than just grind until I get lucky.