I recently finished a legendary Chaos campaign as Sigvald in 170 turns. I didn't bother with conquering the Northern Tribes, i just went straight into Kislev. I took some time reaching the Empire sacking and raiding along the way. When i got there they still hadn't expanded beyond Reikland and I didn't see any of their armies along the way. They only had 2 1/2 stacks of trash so didn't put up much of a fight against Chosen and Chariots with lightning strike. I only had to beat the Armies once, then destroyed Altdorf which ended their ability to recruit and finished them off. Then i went to Brettonia, they also only had their starting province and couldn't put up much of a fight either. Past turn 100 the Greenskins and Vampire Counts also hadn't expanded out of their original territories so they both accepted bribes to become my vassals and didn't have a problem killing the Dwarves for me as they were also weak. Next I sailed to Ulthuan. Around turn 160 Lothern is also sitting in their starting province and haven't expanded at all. I think Tyrion was level 5.... It only took a few turns to kill them and achieve the victory conditions. None of the Dark Elves had large Empires, none of the Skaven, or the Greenskins or any of the Vampires.The largest empire was a minor Norscan faction that managed to confederate all of Norsca and then never went anywhere.
I hadn't played a campaign since last year. I always play on legendary difficulty. The previous campaigns that i played some of the factions became ridiculously powerful late game. Many of them were powerful throughout any campaign. Usually the Dwarves and Greenskins would fight and the winner would become a superpower, Lothern would become a power, Naggarond, Wood Elves, sometimes the Vampire Counts. At least they would all expand and build up decent empires. This time nobody even left their starting province. Even Lothern and Naggarond which previously had become very dangerous couldn't beat their first weak neightbors.
I started a campaign as Norsca, about 70 turns in so far and I'm seeing the same thing. Nobody has expanded at all. Is this the new normal? Is everbody just extremely defensive now, or did their neightbors just get buffed enough that the previously strong factions can't expand?