Champion Mastery and Twisted Treeline
For some reason, playing on the Twisted Treeline won't give you mastery points for playing a champion. And that seems wrong to me. As long as it doesn't show your actual skills, but how much you play that champion, I believe Twisted Treeline should reward mastery points too. Also, the summonner stats(takedowns, cs, wins) are shared between SR and TT as "Classic". There are even players who play TT exlusively so it's not fair for them to not enjoy the champion mastery feature.
Riot, if you don't plan on upgrade the Champion Mastery 'system' to reflect actual skills and actually decay when you're playing bad, then please don't make it SR-only. Thank you.