I just found out that D1 and D2's stories and overall tone came out that way because Metzen was an angry and edgy teenager. In D3, the tone shift was intentional from him and he knows people don't like it. Basically, all of them are reflections of him at different stages lol.
1:02:30
https://www.frogpants.com/blog/2019/...3-i-am-content