Is pointless because nowadays, is very difficult to see a flying wheel, for example.Just because you think its ugly doesn´t make it pointless, in fact it´s not. Otherwise it wouldn´t be there.
Jules Bianchi Crash? Unavoidable the consequences. With or without halo.
Massa spring: nothing.
And what happens, If the halo reflects the wheel to a Marshall or to the crowd?
I believe that the FIA has introduced this system as a method to wash its guilt in the 2014 Suzuka gp, rather than as a system that actually protects.