ARAM Aura Poorly Considered?

I've been playing again recently after several years. I was playing mostly legacy ARAM because Summoner's Rift is too slow for me, then quit due to the constant chat bullying by ragers.

Soraka and other healers were allegedly OP in that according to the new doctrine. That is news to me because I thought it was Blitzcrank and Zilean that were strongest in the old times. My win rate so far over several matches with Soraka in PvP Crystal Scar is 6/0 and 0/2 in Howling Abyss, with Anivia 3/0 in HA including a 4v5. In my last match with Anivia I was 18/3/26 and it was very close. The reason for the 100% in CS is by my diagnosis basically the same as what allegedly makes heals OP in ARAM:

1: Most players don't understand that you need to fully commit to diving squishies against a team with that support instead of poking. 2: Tower proximity and champ power at the beginning makes a dive kill more difficult to pull off before the target flees behind the tower.

Both of these parameters are the same in every other map. I have trouble seeing how healing is an advantage specifically in ARAM. The lower gold reward for kills and accelerated level advancement and itemization already skewed the circumstance a great deal against tower strength. You either organize a good team dive in the limited space or lose a tower and get more diving room. But after a tower spread increases or the levels or equipment get to a moderate level, Soraka is flat out useless. What are you going to do? Starcall Yi to death?

The impression I get is that Riot is changing mechanics to compensate for people not learning any tactics or communication rather than because there is a champ imbalance at an ideal skill level. I'm interested to get the view of people that have played both at a good ranked level and pub enough to see the difference in how it works out, in case there is some concrete basis that can be quantified clearly contrary to what I'm saying.