Recently, the head of development of the Claws of Awaji DLC for Assassin's Creed Shadows spoke with GamesRadar+.
Simon Arsenault admitted that AC Valhalla (2020) has too much content:
«The game was getting more and more confusing. If you played [Valhalla] on release, it was good, but the longer you waited [before you started playing], the more add-ons and free content appeared. At some point, the game turned into a monster. It was already a monster, but by the end it became even [bigger]».
When working on the expansion for Assassin's Creed Shadows, this point was taken into account and they tried to avoid increasing the scale, this was also helped by resource constraints — the DLC was made by a smaller team than worked on the main part.