Global state is OK, but I think we need language features or sugar to help embed the components. If those language features can be nice mathematical generic features like you have in Haskell that is better.
An example is a calendar control, in a grid control in a tab. You click right to go to the next month. That event needs to be bubbled through layers of boilerplate code to direct it back to the calendar's view.
Also another consequence is that the model is a mix of business data and UI state data. The selected month shouldn't affect the business logic, but it is bundled with THAT data which is annoying.
Not sure what the solutions are though.
