I would like to contribute to this discussion as someone who played something about 6k ARAM games.
Yes, current ARAM balancing is trash.
No, I dont agree with simple math changes in damage output/input, and I think they are contraproductive.
I am happy with rune changes, dark harvest-triumph meta was boring af.
Now some more detailed info and problems I have - for a long time, I considered ARAM practice mode, where I can get familiar with many champions, their kits, usefullness and numbers. And it is fine. When I realised I am not going to play anything else besides this mode, I inclined towards - get me the sh****est champion you have and I will make it work. And it is FINE. I never considered aram balanced and I never wanted it to be balanced, because I understand that certain kits are just useless in siege/teamfight. And it IS FINE. I met few dozens of people who main ARAM just like me, they were making special champion collections just for Howling Abyss, same as fabulous solo Q one-tricks who hard carried games like total beasts, even if their champion wasnt considered strong, AND IT IS FINE.
Yes, some champions provided more (maokai, veigar,...), but those are all very simple champions everyone knows and lot of their power could be...avoided. Current meta seems to be focused around Akali (17% damage buff, takes 8% less damage) and Kaisa (very similar numbers). Their playstyle has always been annoying, now they simply take over games and there is nothing you can do about it. Their winrate was bad because people who play ARAM regulary dont practice mechanics and others simply chill out with anything they get, not because those champions were weak. People who are new to them will still lose, because they dont know their potential, but it takes too little to hard carry with them. Maokai on the other hand, character that anybody could enjoy is now trash pick who cannot tank or deal damage. Same with poke mages (who were not strong, especially since healing shrines got changed).
Problem that many people had with old ARAM was indeed nonexistent balancing, but it was also element that drew others in. Changes to runes and items proved that this universally available form of balancing works just fine, everybody agreed with them, so all we need is more items to work with, fair game with fair tools, not bunch of random stats based on general winrates (not ELO, as some half-brains suggest). And perhaps some more useful suggested items (I read about kaisa balancing and the main reason why she got buffed despite ap build effectivness was, because "people still play her as AD and not AP").
Astrocythes, signing out.
edit: Disulfiram, you managed to say same thing as me in about 20 times shorter article. I cannot explain how much grateful I am. Except that sona usually isnt able to poke that well, it is support build that kills all the fun.