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Full Idea
Insofar as modal logic is concerned exclusively with the logic of metaphysical modality, ..T may well be the one and only (strongest) correct system of (first-order) propositional logic.
Gist of Idea
For metaphysics, T may be the only correct system of modal logic
Source
Nathan Salmon (The Logic of What Might Have Been [1989], Intro)
Book Ref
Salmon,Nathan: 'Metaphysics, Mathematics and Meaning' [OUP 2005], p.130
A Reaction
This contrasts sharply with the orthodox view, that S5 (or at the very least S4) is the correct system for metaphysics.