I find myself having to switch between caster mode and observer mode because in caster mode I can’t see what buildings are currently being built by the players, there’s no production tab, while in observer mode I can’t see both players supply/units/resources at the same time. There should be a toggle in caster mode for a production tab showing what’s currently being built.
Another aspect that’s missing from caster mode is seeing if villagers are currently being produced or not.