The only drawback I can think of is that it isn't possible to make it bidirectional using the expression function, but I don't know why it isn't possible to make property bindings work in the same way as tag bindings:
The only drawback I can think of is that it isn't possible to make it bidirectional using the expression function, but I don't know why it isn't possible to make property bindings work in the same way as tag bindings: