Or you will actually figure out that on ARAM, Eve is so vulnerable to poke that you have to go complete off-tank with her. If you're facing a Ziggs and Xer, you'd kind of be retarded not to buy a shitton of MR.
Every team comp can win. It's like saying "You can lose on champ select on S-Rift".... yes, you can, but only due to your skill, not because the enemy team is OP and you aren't. Those are excuses for 5-year olds. On ARAM, poke comps are extremely good because nobody gives a rat's ass about waiting it out - no one has patience, so of course you'll rush full AP Mumu against Sona, Soraka, Varus, Ziggs and Cait, and then wonder "why did we not surrender, this is lost from the start!" - well of course it is when you have no idea how to deal with a poke comp.
Every team composition has its weakness, and unless you nullify their strength by covering up your weakness, you are going to lose, son, no matter if it's ARAM or S-Rift.
Also, gold income in ARAM is helping you AGAINST teams with the likes of Ziggs, Varus and Xerath, simply because they fall off tremendously after mid-game, whilst you (a tanky melee fighter) only grow stronger with each item. You can kill a Garen when he's level 5 and has 1 item pretty easily with any champion, but try doing the same with a mage after he hits 18 and has a full build with a metric shitton of MR. He's still going to deal damage - even Eve will, but once mages/poky utility champs do all their burst, what then?
Simply put, no champion is ever OP in any gamemode, as it's just a matter of which one is easier to play. Every single one of them can be countered by ANY champion if played properly, but people often seek excuses to cover up their own inability to deal with the situation at hand.
The reason I started playing ARAM was exactly because I wanted to get away from the S-Rift and all those who'd report you 55 times because you feel like playing adc Sona or AP Pantheon. Ironically, after spending over 2k games on it, I've become insensitive towards people who seem to have fun at the expense of other people's time. If you know that fucking AP Wu is going to go shit (and you know it damn well), then why aren't you at least playing like you have a damn brain, instead of feeding 0-92 and then going afk after 10 minutes. Play AP Wu all you want, but at least do so without damn intentional feeding and ruining other people's games. ARAM is for fun, not for "ye haha here I can feed all I want bcuz no rules apply here hihi".