Consider two objections:
1.) Metaphysics is pointless because it does not reach any definite conclusions. All metaphysical options have remained unchanged, or only been multiplied, since the time of the Pre-Socratics.
2.) The sciences have rendered metaphysics superfluous or false by explaining its conclusions in another way.
One problem to focus on is that the first claim sees no single metaphysics, but an irreconcilable crowd of competing doctrines, while the second sees metaphysics as unified enough in its conclusions replaced by a single method. So how can we see these claims as compatible?
Easy: science is a method that works and metaphysics doesn’t have one. Metaphysics tried to figure out things from principles that were not testable when they should have framed hypotheses that could be decided by a test that could be agreed upon in advance. And so the diversity of metaphysics is a result of its absence of a decent method, and the one decent method we’ve found to solve questions replaced it.
But while this account does a tolerable job at explaining objection 1, it gives us no reason to believe that 2 is true – it even gives us a reason to hold that 2 is false. You haven’t explained any of the conclusions from Parmenides to Heidegger by switching to a hypothesis/test method. You haven’t resolved a single philosophical dispute, whether it was between Plato and Aristotle; the Idealists, Rationalists and Empiricists; Continental and Analytic philosophers, etc.