Does Riot actually support One trick Ponies?

The fact you have to choose 2 roles in ranked & you cannot earn hextech chests if you play the same champ over and over suggests Riot don't like people climbing with only 1 champion. Like seriously, how am I supposed to earn my mastery 6+7 when I am a OTP since I get no chests anymore?? I'm sorry that I rather try to master 1 champ than be mediocre on all champion.
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