Can we now admit that a Tank champion should be tankier in their stats and kits rather than by getting items. Tanks should do what they are intended to do, which is to have CC in their kits, and abilities that make them harder to kill as well. Not every Tank is like this, some are more like Fighters and do a better job at being a Fighter than half the Fighters in the list. Mordekaiser was suppose to be a Juggernaut but lacks really any CC or abilities making him harder to kill (his original Q was much better at this and his passive the same).
I'm grateful most (to all) Assassins are becoming less tanky, and hopefully Evelynn's kit (and hopefully Visuals) get nicely updated in the future. But most Fighters can't initiate well, some Marksmen are not as squishy as they could be, some of the Mages need compensation for the AP nerfs to most of their items, and as a Support main I wish Ruby Sightstone didn't even take up a slot rather that it was an add-on to the already free Sightstone slot. Make it cost more, or have it do less, I don't care but I hate needing this thing take up a slot if I were to go as a Support I would rather be getting mana regen or plain AP on. It would also be useful for Junglers and others since it wouldn't take up much of a slot. And, if I were to buy the Sightstone + Support item, I would like it to be have a separate ward limit.
I also think there's now a lack in diversity for people who go as a AP champion compared to those going AD. AD champs can go with AS/Crit. items or AD (or both) but AP champions have only AP items to go to for help. There aren't many AP + AD items that benefit Mages that could use it, and the same can be said for the Marksmen that have that one ability that can benefit from AP. This is also crucial for Marksmen like Teemo and Corki or use Magic Damage though they are Marksmen in their own right. There are about one or two AP items that increase your AS and about 2 or 3 items that have AP and AD (the reason this was taken away from Trinity Force baffles me to this day). Malzahar, who could use this bonus AD on his pets, has only Hexblade to look into.
Riot still has things they could fix or benefit to and this is just what's relevant to your thread. I'm not even going into Champ IP prices, Twisted Treeline map updates, Reuse of Butcher's Bridge, or the fact they could just allow for people to use Team Builder esc type of system rather than Blind Pick revamp due to it having you only needing to chose one champion and position rather than two positions.