Why Doesn't Avalonia Marshall PropertyChanged to UIThread with Binding?

[robloo]

Over the years I see this trip up a lot of devs -- especially with code coming from WPF. Latest here #18670

In WPF when the binding system subscribes to PropertyChanged/CollectionChanged events on ViewModels and their properties it will also make sure to Marshall the handlers to the UIThread.

This seems to make a lot of sense as we know bindings are for the UI. It also cleans up some cases in ViewModels where you can just use Tasks and background threads to update properties without having to marshall into the UI thread yourself.

Invoking code from the ViewModel on the UIThread also will require getting references it really shouldn't when we switch to multiple UIThreads.

Can this be changed to work like WPF? Especially with #18586.