You can see from them relying on straight CG more often in later fights in addition to going from 1 ADs to multiple ADs per episode.

The choreography was much worse compared to shows like Demon Slayer, Bleach or even JJK from Mappa and the fights simply didn't have that level of hype you would expect from such a show.

Mainly due to Mappa not extending any of the fights and struggling to convey how Fujimoto used manga pages in fights to the anime medium and the simple lack of 2D at times.

Aki v Katana Man Link (watch from here to 1:18)

Honestly, a fan managed to convey the speed and feel of the fight in this cut better (keep in mind, it's 1 fan vs a team of animators + cg + music and voice): Link

This does not usually happen with Anime productions due to the terrible scheduling that production committees force on the studios. There are times when some episodes are finished hours before the broadcast in Japan. Usually studios hope to be 2-3 episodes ahead.

According to insiders the production for Nier has been a shitshow, Covid is a mild impact and not in Japan for animators, the problem is due to the bad production they have outsourced a lot to china, which has been hit hard by Covid.

Even Mappa with Chainsaw Man were offering double in order to get Chinese animators to work on it to get it across the finish line, which is sad because it was supposed to be Mappa's new studio and new method which ended up not having a great schedule, which is why fight animation continued to struggle.

Very few studios get to usually command enough time to properly make episodes such as KyoAni or Ufotable.