You know the vast majority of these people will be on fixed contracts? Sometimes things don’t work out. They get moved onto different projects. Others do their contract time and then finish. It’s nothing new in any business.
Since they happen 300 years apart and one is on an island and the other mainland. And also one features an invasion of the Mongol Empire and the other is set during the unification of Japan by Oda Nobunaga there are going to be vast differences. Not just aesthetically. I think it’s slightly unfair to compare the two as the times are different. Tsushima has an outside invading force. Shadows has wars happening between its own people. Nobunaga set out to subdue or conquer the other provinces. Some did subdue and others resisted. As for the games themselves, they weave their own fictional stories around real events. Whereas Tsushima’s antagonist is fictional. Shadows isn’t. There was no Khotun Khan or Sakai clan but there was an Oda Nobunaga, Akechi Misuhide, Ladies Oichi and Nene etc..The events that take place in Act 1 of Shadows really did happen like the attack on Iga Province and the Honno-ji incident. Plus the outcome which then brings our two protagonists together. One the fictional daughter of a real person and two, a real person in History.
I do think comparisons are not needed because they are two very different games.