I actually enjoy stories that have some conflict, and considering Yuel's personality and upbringing, OF COURSE he deals with horrible depression. So I don't mind crying, especially if there's a happy ending.
A big part of Yuel and Tavi's relationship is that Yuel has some pretty serious mental health issues but Tavi loves him nonetheless. It's an important part of their dynamic, so I'm glad it's appreciated 🙏
Although, knowing that Yuel's mom and Tavi's dad were a thing, my headcanon is that they're half brothers but don't know it. Especially after playing All Idleness and Ephemera. Either way, I love seeing them accept each other flaws and all.