Pretty much whatever you're using 3.7 for. You don't need as tight a scope. It does easy things well.

An situation I had yesterday: we had two dropdowns. For simplicity, let's say it's country. When you pick a different country, it shows states. When you select state, then change country, it crashes because the state doesn't exist in the new country.

The standard solution is simple – just make it reset to null when switching countries, or better yet, check whether the selected state exists in the new country. But the thinking models will overengineer the hell out of this. They'll check from the deep service level when these checks can be made just below the view layer.