I share your opinion. In agile teams, it is important to do things that work. If a team owns a stack sucessfully, there is no need to change that. But if the en

I share your opinion. In agile teams, it is important to do things that work. If a team owns a stack sucessfully, there is no need to change that. But if the environment changes (e.g. growth), the team may decide to split / specialise in order to ensure that the business goal is not in danger. There is no silver bullet.