It would be great if we can have bindable readonly time slots, Where are optionally no appointments are possible. 
This is useful for breaks (no appointments at lunch time) or holidays.

WPF and Xamarin supports data binding to INotifyCollectionChanged (ObservableCollection) and INotifyPropertyChanged.

This binding scenario is widely used.

So implementation of this feature allows WPF and Xamarin developers use their experience and code base in Blazor.