Can everyone just only gain XP in ARAM from the passive generation?

Dead or Alive, everyone on both teams just gains XP overtime ONLY at a uniform rate. That way everybody on one side does not hit lvl 6 a millisecond before the other team and wins the fight solely because of that sudden level advantage. Seriously, if one side dips down 1 level, they lose so much since they cant recover the gap as easily with everybody proximity sharing it all. The trickle you get from being alive is only so-so. Why not just have everyone only gain XP from that trickle, except boost it to a better flow? that way one side can't end up 2-3 levels over the other team unless they have a Zilean.