Riot should throw a bone to one-trick players regarding Hextech Chests from S ranks.
For every chest you earn on a champion, it takes double the number of S rank games to earn the next. But only the first S rank chest can be earned with a queue partner.
For example, after your first S rank chest on a champion, it would take 2 S rank games to earn the next. The maximum number of S Rank games to earn a chest would be 8 (so the fourth chest and all after that).
And don't give me "but you get to climb with said champion" because I only play Ranked to Gold 5 and quit because it's not worth the stress. It is not a valid excuse to deny rewards to someone playing a smaller variety of champions.