Darker and edgier?
People complained nonstop about the more lighthearted tone the story had, especially with the role quests
The MSQ got darker in certain areas but overall it was more lighthearted compared to what was seen in Endwalker which is what came directly before

also, FF7 isn't really an edgy FF title
Can't say much about FF8, I have yet to beat it but plan on it someday soon