If we call metaphysics the discipline … that purports to define the   basic structure of the world, then empirical metaphysics is what the   controversies over agencies lead to since they ceaselessly populate the   world with new drives and, as ceaselessly, contest the existence of   others. The question then becomes how to explore the actors’ own   metaphysics. - Bruno Latour
Bruno Latour takes it upon himself to suture the fractured and  fragmented discourses on Ontology and Metaphysics by resorting to  relativism to create what he calls a “practical 
metaphysics”.
Of course, by “practical” he means “plural”.
The question is this: even if a plural metaphysics as enunciated by  Bruno is stable enough to theoretically examine all phenomenon and  express it as a function of a most clearly crafted Ontology, will such a  relativist theory of reality be able to survive the transition into  Praxis? In other words, will my ability to gauge and measure the  ontological weight of someone’s claim not break down my own subsequent  attempts to affirm or deny the causal contingencies arising out of me  being weighed down by the said ontological weight? Put simply, the first step in the exploration of the personal metaphysics of an actor is pretty much always a rejection and denial of the logic and rhetoric structuring the metaphysics of all the other actors in the network. Verily, the very possibility of a metaphysics arises out of the possibility of the metaphysics.
In such a situation, I presume, one will have to forgo one’s  commitment to any relativism that is equally and evenly distributed over  causality and choose to assemble a single ontology from the  multitude of varying and contradictory metaphysical claims of other  actors in the network.
However, rationality forces us to conclude that in a finite network  ontological patterns will develop within all the local mediators  preventing a state where any kind of near-absolute relativism (necessary  for any pluralistic idea of metaphysics) may gestate. Latour,  therefore, has given birth to a baby that’s stillborn if held  upside-down but comes alive as soon as you turn it around and ask : “can  metaphysics save relativism”?
A traversal of an actor's own metaphysics then is not much different than the traversal of his own politics. In-fact, such hollow multitudism will only thrive until the actor realizes that by short-circuiting metaphysics with pragmatism, he has all but extinguished both. All that remains thereafter, is to consolidate the (remaining) relativism for the sake of pragmatism and since democracy is the obvious tool-of-choice for such tasks, we can remain sure that one of the last functions it will perform as a human tool is the consolidation and reduction of empirical, metaphysical relativism, thereby giving birth to either a compressed relativism or perhaps even a pragmatic absolutism.
Now can you smell the totalitarian disaster that awaits us at the other end of pragmatic metaphysics?