I haven't actually finished the anime yet. I'm like 90% finished with the first half of Alicization.
But I have read all of the Alicization LNs. I guess the LNs just spoiled me a bit because while I do definitely enjoy the anime adaptation and think it's the best arc of the entire series, I also think they rushed it just a bit too much. I don't feel like we are given enough time to appreciate the characters they introduce. So when events happen with them, it didn't feel as impactful. This goes for all characters too, friend and enemy alike.
I mean, I totally get and understand why it's rushed as much as it is. If I recall, I think the anime goes at a pace of 3-4 episodes per novel during the Alicization arc. This makes sense because there are 10 novels for it to get through. But for the first two anime seasons, it went at a pace of approximately 5-6 episodes per novel. So the change in pace is quite obvious.
The Alicization anime cuts a ton of character development and even downgraded an entire subplot to a montage. SAO's anime is usually a very good adaptation of its source material (bar the simplification of the "Murder in the Safe Zone" plot line in Aincrad and the complete omission of the Jotunheim plot line in Fairy Dance.) So seeing it cut out interesting plot details was somewhat disappointing.