It is. This is a fact. Everybody can see, that the majority of punishments are handed out to flamers, while flamers usually flame trolls, and assuming that the enemy team wont flame the troll, and the troll wont flame himself, there should be an approx. 4:1 ratio on flame and troll punishments. Lets say players tend to see trolling, when there is no trolling, make this ratio 20:1. I'm totally sure, that the real ratio between these 2 kind of punishments is totally different (I mean more for flaming). But nvm, this doesn't really matter.
Experimenting in ranked should be punished. If you want to try out nunu adc, go and try nunu adc, IN NORMAL. When you are confident enough to not totally suck with it, go to ranked idc. But a ranked player who has never played jungle goes ziggs jungle bc why not, is not really an useful teammate.
And going back to your point: "decidedly less enjoyable game experience" - Do you think an experimenting useless jungle doesn't affect your game experience? Or the adc, who starts buying tank items and inevitably throws your game? Or the toplaner who mindlessly pushes whole game and dies 15 times in 25 min, with almost 0 kill participation? These all ruin the game experience for both teams. So if your idea that we should punish players bc they ruin the game experience should be used on these kind of players too, don't you think?
So lets be honest with each other, we both know that Rito does almost nothing with trolls/inters. (Just for testing this, I have another account where I troll almost every 2nd or 3rd ranked game, just to see when does it get banned? The acc is still not banned (not even a warning) for like 2 years. So yeah, tell me trolls are punished too xD
BTW I am not saying that anybody who goes 0-15 in 25 minutes bc he had a brainfreeze for some random reason should get banned (same with ppl who spam "kys"), you don't know what happened to them, maybe they are just too frustrated, but didn't see this before they started a game. Why cant you just ban them from PvP games temporarly? You sucked in ranked and ruined the game for 9 players? --> Go win some PvE until you l2p or chill. You got a brainfck and flamed like a moron whole game bc the jungler fed your lane? --> Go play some PvE until you chill and can focus again. Actually when players get tilted, they tend to flame or troll, so why cant you just close them on a playground where they can chill? And OFC, if this happens regularly, you can still go for perma, but this shouldn't be that easy.
And one more thing I would like to point out: The flaming problem is SOLVED with the mute button. Yet players have no way to deal with trolls/inters.