Full Idea
In the heyday of modal logic, philosophers typically tried to account for any metaphysical notions in modal terms.
Gist of Idea
Using modal logic, philosophers tried to handle all metaphysics in modal terms
Source
Correia,F/Schnieder,B (Grounding: an opinionated introduction [2012], 2.4)
Book Reference
'Metaphysical Grounding', ed/tr. Correia,F/Schnieder,B [CUP 2012], p.10
A Reaction
Lewisian realism about possible worlds actually gets rid of purely 'modal' terms, but I suppose they include possible worlds in their remark. Annoying for modal logicians to be told they had a 'heyday' - a nice example of the rhetoric of philosophy.