They gave Family some pretty crazy weapons, though they got tied to lower levels, like most unique mechanics, sadly.
Personally, I'd love to see council get some of their low level mechanics back, like shapeshifting and the occasional swarm of robots and robotic mech bosses. There are so many interesting villain groups, yet you never encounter them past a certain level. You stop encountering drones like blasters and disruptors for Arachnos, Council stop shifting, Crey lose their scientists debuffs/buffs for swarms of power armor lead by paragon protectors, circle of thorns lose most of their variety and only have death mages, archers and demons, PSI PPD stop showing up in favor of peacebringers, the list goes on.
Might have to make a thread just for that, really. I feel like it would add a lot of flavor to the post-50 game if we could run paper missions with an old enemy group of our choice.