Whoever came up with the ARAM summoner spell changes obviously didn't think it through in the least
Really, what kind of balance 'expert' would think it's a good idea to nerf the spell many melees pretty much need to compete in ARAM whilst simultaneously reducing the cds of all the spells ranged champs can freely use because they're not being shoehorned into needing Mark?
Know what it feels like to be a melee champ in ARAM right now? Especially a damage-dealing melee? Even worse than it felt before Mark was a thing, because now when you manage to actually get to the back line, you're pretty much guaranteed to be met with an exhaust or heal/barrier (or frequently multiple of them) to blunt any influence you might have outside of cc.