Area Damage is the cause for the majority of lag in D3.
It also is one of the major reasons for why groups pull together large amounts of enemies (and thereby to a certain degree also contributes to the existence of support classes).
Since lowering / squishing the damage and health number will do little to reduce the lag (because it is the amount of calculations that are causing the lag, not the large numbers themself), something should be done to reduce the amount of calculations that need to be done, …
… and that means to either remove Area Damage completely (aka mitigating its effects down to e.g. 3% at level 70, similar to how it works with % Bonus Experience, or even down to 0% at level 70) and no longer let it spawn on items, or it had to be reworked to only hit up to e.g. 5 enemies per Area Damage proc.
Though, the latter option of limiting the amounts of enemies that can be hit by an Area Damage proc might cause additional calculations to figure out which enemies will be hit by the proc and which not, so it might not be effective in what it is trying to achieve.
Removing Area Damage would not really be a bad thing, as in the past, we had to replace existing gear many times already, e.g. when a legendary item now spawned with 600-800% increased damage to Skill X instead of 300-400% increased damage to Skill X, so having to refarm some gear would not be the first time this happened.
Please devs, consider this. Removing Area Damage probably would not even require much work, but it would have many positive effects.
Thank you very much!