I'll try to keep this short, simple, and to the point. Based on the CM response to a particular topic, I believe it would be a better design practice to split off the third list of affixes into two different lists:
Aggressive CC (Limit 1)
If you look at the original third list, at least 3 CC abilities (Frozen, Jailer, and Waller) prevent or alter movement and attack positioning while 2 of them (Plague and Molten) provide close range damage over time.
Because of the original third lists' lack of limits and grouping of the various effects, I believe that this is one of the reasons why Inferno seems to have a fluctuating difficulty in regards to it's elite/champion packs: redundant affixes.
By splitting up the original third list known as "Aggressive" into two different lists, I believe that this can actually make the difficulty curve of the elite/champion packs to be more stable. Since each list is limited to 1 ability, you would see more elites and champions that won't look like a bad roll and force players to restart or skip areas.