It is not so bad. Authoritarians have a lot of quite powerful mechanics and can be a strong choice if you're not going to be a Xenophobe (because it is another way to unlock the most of these mechanics).
Slavery is strong. Raiding bombardment can be even OP. Stratified Society is a bit helpful. More influence is always nice. If you wan't to appease factions - egalitarian faction is an annoying one because they dislike resettlement, slavery, leader enhancement policy and migration controls.
Egalitarians have more straight-forward bonuces and strong civics. Benefits from being Authoritarian are not so obvious, but can be even more valuable.
But I'm not sure that FA required a nerf and FE required a buff. It feels not as balance change, but as RP-driven change or even as proclamation of some political beliefs.
Yes, this is bad. Auth has been nerfed repeatedly in various ways. This is just them kicking someone who's already down, and doing so for absolutely no good reason. While giving one of the singularly strongest Ethics another buff.
- Slavery isn't strong anymore, hasn't been for quite a while. Ever since the bonuses stopped affecting Specialists.
- Nihilistic Acquisition isn't that great. You can achieve the same damn thing simply via taking that planet, resettling the pops, then releasing it as a vassal. Hell, you're better off long term this way.
- Their dislike for resettlement is miniscule and more than compensated for by other easy to enact policies and requirements.
- No, Egalitarians have some of the singularly best bonuses and civics in the game. They have a huge number of benefits. Auth gives a benefit to the WORST jobs, some miniscule Influence income, and now punishes you further.
And yes, this is RP. But bad RP. It's a situation where somehow the Egalitarian Empire is this weird idealized utopia that does everything right, and rather than having any drawbacks always has the best outcome. While the opposite applies to Auth. It feels more ideological than game balanced at this point.