Personally I like points 2,5,6 The others I entirely disagree with.
2: I think assassins have gotten way to many indirect buffs. With basically the meta favoring early game stuff and resistances being a joke. Tabi nerfs way back when. A sprinkle of assassin buffs to the champs themselves stuff like that. I don't think anyone argues assassins are too strong but I personally think its more of tanks being too weak/ peel being too weak not that they themselves are out of line.
5: I think riot needs to add more defensive runes to other trees other than resolve. Before runes reforged you could take your defensive runes in a bad matchup. Now it seems every non keystone rune in anything that isn't resolve is an offensive rune. Get some diversity in there and add some defensive runes too the other trees so that we the players can have more variety in runes. Cause right now it seems that there is one best thing to take on every champ and that doesn't change at all from game to game (assuming you play the same champ)
6: This is a weird one to me. Because I don't like the idea of making melee/ranged only because the game has never been made or geared around that. But I also think that riot needs to do something about these edge items. Personally I think when riot builds items geared towards bruisers it creates a problem biggest example was black cleaver. Then again the bruiser class has always had it's issues that I think riot are still trying to figure out how to handle.
1, 3, 4: GAmes IN MY OPINION are almost at the right length. I think people just still have that ptsd of when snowballing was at it's worst so now everyone has the attitude of i died twice time to ff15. personally I'd like to get rid of ff15 so that people are more obligated to play it out because so many times i have seen teams get a huge lead and throw it away because of the elo im in. WHo doesn't like a good comeback story. ADC's are fine. Meta just sucks for them because crit adc's are strong but the early game meta just doesn't allow them to get online (most of the time). I don't think damage dealt is way too high again I think resistances and building defensively is hot garbage. Wouldn't mind if riot put some effort into buffing defensive builds which in turn would also help out point #2
Just my thoughts feel free to critique or flame me if you feel the need too just my general thoughts on the game coming from a gold (trash) 2 adc main