Full Idea
When the possible worlds semantics were further extended to model notions of knowledge and of moral obligation, the application was beginning to look distinctly forced and artificial.
Gist of Idea
Using possible worlds for knowledge and morality may be a step too far
Source
Horsten,L/Pettigrew,R (Mathematical Methods in Philosophy [2014], 5)
Book Reference
'Bloomsbury Companion to Philosophical Logic', ed/tr. Horsten,L/Pettigrew,R [Bloomsbury 2014], p.26
A Reaction
They accept lots of successes in modelling necessity and time.