So remember, if you get your STAR cancelled, or slowed, or vectored all over the sky when you are only 40 MTR, you already know the answer why - so don't bother asking the question!
BTW, that highly refined piece of engineering called MAESTRO which the airlines got told will solve their woes, will NOT take in to account aircraft flying different profiles - see previous answer above.
As usual the golden rule applies:" ATC don't delay aircraft - other aircraft delay aircraft".
Solution? Build some more runways - good luck getting it past the NIMBY's. (I hear even Tyabb is getting noise comlaints now!)